Here's some great news if your carrier of choice has the color magenta all over it, and you own either an HTC Amaze 4G or an HTC Sensation 4G. Both those phones will be updated to Android 4.0 Ice Cream Sandwich at some point in the future. This information doesn't come via a leak, but it's officially straight from T-Mobile itself.
The carrier has updated its support documents for both the Amaze 4G and the Sensation 4G, and the newly revised documentation clearly mentions ICS updates, as you can see.
Unfortunately though, T-Mobile hasn't publicized any other details about these updates yet.
Unwired View, T-Mobile's HTC Amaze 4G and Sensation 4G will be updated to Android 4.0 Ice Cream Sandwich