Windows Mobile 6.5 is expected to be officially announced in Early February at the Mobile World Congress so lots of rumors are currently floating around regarding what it will look like.
Click on any of these links for more information:
First Windows Mobile 6.5 Screen-shots leaked at Mobility Site
Some more Windows Mobile 6.5 Screen-shots! at Mobility Site
The New Windows Mobile 6.5 and Mobile World Congress at PocketNow