Since Windows Phone 8.1 Preview SDK has already been seeded to developers, leaks also have surfaced showing a glimpse on this highly anticipated update from Microsoft's Windows Phone division.
Notable (or most requested) changes that are coming to WP 8.1 are the following:
- Option to use on-screen buttons as opposed to hardware via Navigation Bar
- Rumored “Cortana” Digital assistant
- Much improved Camera interface and features
- Separate volume controls for media and notification ringtones.
- Ability to install to SD cards!
- The much awaited VPN support for enterprise users
- ..and lots lots more..really!
An (incomplete) rundown of changes is being compiled here. And checkout this Reddit thread for more.