Neowin came across a video clip that shows off some of the changes in the leaked Windows 8.1 (Blue) Build 9385.
A video posted by Bavogames on YouTube shows off some of the changes in this version of Windows 8.1 They include some additions to the in-house developed Alarms and Movie Moments apps. However, there's also been some major changes to something that will affect website creators; the development tools put into Internet Explorer 11.
As McAkins Online points out, the video shows that the tools, brought up by pressing the F12 key, have received a new user interface that's similar to that of the current Visual Studio UI. This is apparently the first major change to these tools since the launch of IE8 several years ago.