Media editing: audio and video; Audio effects, video effects; Slow motion video
Apps can capture audio/video from themselves
Media files that are downloaded via IE are automatically added to your phone XBOX Media library. (mp3s are added to XBOX Music, videos to XBOX Video)
Stereoscopic 3d support
YouTube Player including HTML5 video support (video playback doesn’t have to be full screen) And you get custom UI, so YouTube Closed Captions are in
Separate volume controls for ringer, media, etc.
Networking / Connectivity
Wi-Fi Direct, a Wi-Fi standard allowing direct peer-to-peer connections over Wi-Fi without an access point
Sharing secured WI-Fi Networks with contacts if they have Wi-Fi Sense. They don’t get to see the shared password though
VPN (Virtual Private Network)
Bluetooth 4.0 LE (to non-Lumia Windows Phones)
Feature to mirror Windows Phone screens to TVs and/or monitors
Enterprise enrolled phones can have their passwords changed and remotely locked
Moving closer to universal metro apps (.appx)
Background tasks: Bluetooth signal strength, Chat message notification, Device connection change, Device use trigger, Gatt characteristic notification, Location, Push notification, Rfcomm connection, System event, Timer
Geofencing API for location-based reminders
‘Battery Power Sense’ info regarding battery usage and percentage remaining. Also lists in order which apps are using the most battery power (nice!)
Ability to install apps on inserted SD Cards
Auto-updates for apps (just like Windows 8.1)
Better backup functionality, now includes app data
Support for new screen sizes: qHD and QHD (1440 x 2560) and smaller (384 x 640)
Almost every API in WinRT can run on WP8.1 (WinPRT) these include video and audio transcoding.
Better Data sense that auto compresses web pages to your specified setting (high, standard, auto, off)
Ability to add ‘trusted’ NFC tags/devices so you are longer always prompted to accept content from them
Screen recorder: Ability to capture screen activity
Quiet hours (similar to do not disturb in iOS)
Along with normal updates, there are now “important” updates.
Operators can also install certain applications once a SIM card is detected
Possible Notification if charger isn’t of adequate power
Screenshot button combination is now Power + Volume Up?
Voice Narrator for Accessibility?
No Facebook integration in People Hub. ‘Facebook Blue’ app to be installed as default
Photo hub decoupled e.g Facebook photo thumbnails will no longer directly appear, a hook/link to Facebook photos will be used instead to view the photos within the app.
Redesigned Xbox Game Hub
Xbox Music and Xbox Video as standalone apps instead of the Music + Video Hub (allowing more updates to be pushed)
Updated camera layout, similar to Windows 8.1 including burst mode. You can specify retention period for burst photos to stop them filling your phone.
OneDrive (previously SkyDrive) with integrated file browser (just like Windows 8.1)
IE11 improved with WebGL and Normal mapping support. IE Tabs button has been removed and multi task view is now the main way of viewing your tabs.
IE: password manager, tabs, history, favourites now syncs with desktop IE
IE has ability to upload and download files. Downloads are stored in the download folder, files in this can be shared to apps and NFC
IE has a reading mode and inPrivate browsing mode
Twitter integrated more deeply into the contacts Hub
Ability to select your own default messaging app
Ability to post to multiple social sites removed. Instead it will work more like the share charm in Windows 8 where you are presented with a list apps you can share the content with, and can only select one.
Calendar App has a new weekly view
Bing apps across phone and PC will sync together using MS single sign account
People hub now has the ability to show contacts who only have phone numbers
Mail: Options to always download emails and pictures within them. Encrypted and signed e-mail support. New Email sync options with accordance to usage patterns (i.e. If you get a lot of mail on particular days and if you don’t check mail every day).
Office Lens app. scans whiteboards and documents directly in the camera as a Windows Phone Lens. The Office Lens lets you scan whiteboards, documents, and more with your phone’s camera, then optimizes the images so they’re clear and easy to read in your notes.
Password protected Office document support
Wallet supports tickets and membership cards?
Inner Circle of contacts. Up to 40 contacts can be in the inner circle?
Search and New Services
Single sign-in for apps (like on Windows 8) with Microsoft Account; sign in will persist across devices + apps with permissions prompt
Cortana personal assistant that utilises Bing services and FourSquare datasets.
Bing smart search (similar search system as Windows 8.1)
Windows store will provide recommended apps based on your location and recommendations based on your Facebook friends
Windows Phone 8.1 apps won’t run on 8.0 devices until they upgrade
Documentation confirms ALL current Windows Phone 8 hardware to get 8.1
Navigation and UI
Slide down to close apps
Navigation bar color selection
Back button doesn’t terminate the app instead it suspends the app
More efficient multitasking
Filter through installed apps by usage/install date
Quick settings access (Wi-Fi, Bluetooth) by doing a quick swipe from the top of the screen
Action Center (notifications) accessed by doing a full swipe from up to the bottom
Ability for apps to issue Silent notifications, update/delete notifications
RUMOUR: new ‘large’ tile size
RUMOUR: mark a Live Tile as read by swiping from the left of said tile
RUMOUR: Improved keyboard possibly like android ‘swype’ (unofficial tip off from Tom Warren)
Ability to choose your own start screen background
Functionality for On screen windows phone buttons that you can swipe away
Search button is ‘frozen’ when using ‘full screen’ apps to prevent accidental launch of Bing search. When the user is: Taking a photo, Capturing a video, playing games the search button will only work if you double tap it. This is following complaints of users accidentally launching search under the scenarios mentioned above.
Pivots are using slightly smaller typography (basically title text doesn’t use up so much screen space!)
Tweaked transition animations
WP uses same progress ring as Windows now.
Three column tile support (probably only Lumia 1020 and 920)
Possible Double Tap to Power Off
You can favorite photos by tapping a heart icon