Seems to always happen, doesn't it? Just a few hours before the expected announcement of the HTC Sensation at an event in London, the phone formerly known as the "Pyramid" makes a full-fledged (albeit short-lived) appearance on Vodafone's site. So we know exactly what we're looking at -- 4.3-inch touchscreen at qHD (540x960 resolution, 1.2GHz dual-core Qualcomm Snapdragon processor, 8MP rear camera, 1.2MP front-facing camera, 4GB of internal memory, and all the other usual stuff.
What we don't have, of course, is pricing and release date, so we'll at least have that to look forward to later. The page has been taken down, but nothing's ever gone on the Internet, folks. See you in a few with the official announcement. [Vodafone (cache)] Thanks, @ch3tman!