Good news for T-Mo customers with either the HTC Sensation 4G or the Amaze 4G: ICS is coming your way... sometime in the future. T-Mobile just updated its support documents for each device stating that they will be getting Ice Cream Sandwich, but it's just not sure when that's going to happen.
There are no other details available at this time, either - but it's still nice to know that Magenta loves you enough to go ahead and put the info out there that you will be getting ICS. T-Mobile should update the support docs accordingly as new information becomes available, so we'll definitely be keeping an eye out for any new developments.