Looks like HTC and T-Mobile may be pushing ICS to the Sensation 4G sooner than expected, as the Sensation's support documents on T-Mobile's site just got an encouraging update:
May 2 News: The Android 4.0 (ICS) update for the HTC Sensation 4G has completed its testing process and we expect it to be available very soon. Please stay tuned for an official communication from T-Mobile regarding how and when you’ll be able to receive the update.
This is definitely good new for Sensation owners, considering a previous leak suggested that the update wouldn't be available until mid-June. Since that was likely just a projected date, it can only be assumed that the testing phase has gone better than expected for HTC, as this is the first support page to receive any sort of prospected timeline as to when ICS will hit (although "very soon" is still quite vague).
Given this, the estimated date of May 14th for the Samsung Galaxy S II's update isn't looking very good. I guess Samsung isn't having as much luck as HTC when it comes to testing.
Either way, it's nice to see HTC and Team Magenta working together to bring the users what they want.