Chinese website XDA.cn seems to have gotten their hands on the unreleased version of Sense 3.5 from HTC. As the version number suggests, the new skin is not different than the v3.0 in a revolutionary way, it is evolutionary indeed.
HTC Sense 3.5 is expected to be launched with the Android smartphones HTC Vigor and Bliss. From the video, it looks like the identifier of Sense, the curved dock at the bottom, has been done away with and has been replaced by a Call and a Mute button. There is also a sidebar dock that features a few shortcut menu items.
A few other updates are a tweaked unlock mechanism and new animations to delete the home screens. In all, it is a very appreciated update and shall surely delight the HTC Sense fans.
Here's the video created by XDA.cn.