HTC has started rolling out Ice Cream Sandwich update for Sensation users in Nordic countries and Sensation XE users in Germany. It is now available OTA and can be downloaded now. Company is expected to push the update in other European countries in the coming days.
There is no official change-log, but according to user reports on XDA forums, this update contains Android 4.0.3 build and Sense 3.6 UI. If you are one of adventurous Sensation users and have S-Off and stock Gingerbread build, then you can flash this update file directly on your phone.
We are expecting official company statement anytime now and will update the post once we get it.