Word showed up this morning that the ICS update for the HTC Vivid was beginning to roll out; however, AT&T says that's not the case. But... you want ICS on your Vivid now, right? Seems that one clever chap found a way to manually pull the official update by typing *#*#682#*#* in the dialer. Seriously, give it a try. I bet you'll have the same results as several users on XDA.
Photographic evidence that we're not making this crap up.
The update will bring the system up to Android 4.0.3 with Sense 3.6, and, as of this moment in time, there is absolutely no reason to think that this is anything other than the official update, which we expect to being rolling out OTA any time now.