XDA hacker Shadowline has published a series of screenshots showing of the latest improvements in Windows Mobile 6.5 build 23022. Apparently the changes break compatibility with many applications, but hopefully this is not a permanent situation.
Firstly, the move of the OK button to the bottom of the screen seems like a permanent feature.
The task bar now features enlarged icons when you tap it, with the list scrollable horizontally.
The volume icon now produced a much larger and more finger-friendly pop-up.
This above picture is a mock-up, but the lock screen now appears to code for play controls while the device is locked, which should be a pretty cool feature.
Lastly, double-tapping anywhere on the screen now produces a magnifier pop-up.
The rate of improvement seems much faster than seen previously, and is likely the result of increased investment by Microsoft in their Mobile and Embedded Division.
Read this XDA-Developer thread for more details, and if you are more adventurous, a download of the cooked ROM.
Thanks wreiad for the tip.