A developer has started leaking details about Windows Phone 8.1 at Rediff. Below are some the changes revealed from Developer preview SDK,
Details:
VPN support confirmed
Apps installation on SD Card is possible
Windows Pone 8.1 will have javascript support.
EDIT: So the camera app has 3 new mode: camera, burst and video
EDIT: Pivots, now called Hub, have smaller title. More screen space!
EDIT: Lots of new transitions by default
EDIT: Progress ring from WinRT is here.
EDIT: Get a sense of your storage 😉 and install your apps on your SD
EDIT: No new tile size from what I seen in the default apps and the SDK :/
EDIT: File manager? Docs talk about a file picker and saver. So there maybe a file manager in the RTM!
EDIT: New youtube player!
