I'm assuming you missed the initial Gingerbread OTA update. Since this is a revision to the original T-Mobile Gingerbread upgrade that was cancelled in the middle of the upgrade campaign a few months ago; I don't know that there is actually a legitimate copy available of the newest 2.3.4+ build for MT4G outside of T-Mobile. Sit tight, I think they just started this round of updates on the 20th of December.
I want you to try this- go to: menu, settings, about phone, software updates, "check now". See what it offers you. There is a HTC security update available. I'm running software number 2.32.531.1 with the HTC update I just ran 20 minutes ago. let me know what your phone says.
I'm glad I didn't wait for the original OTA Gingerbread upgrade or I probably would never have received it. (I used a verified copy available online at the time) Supposedly T-Mobile had pulled the OTA update program to fix a few bugs and add a few other things (GMAIL updates, etc) to the original 2.3.4 for MT4G. We'll see what happens. After all, ICS is right around the corner & I hope they port it to MT4G as I'm not buying another android phone. Mine is less than a year old.