T-Mobile’s HTC myTouch 4G Gingerbread Update rolling out today, tomorrow, next week, and throughout the year?

The T-Mobile myTouch 4G (HTC) will be getting the Android 2.3.3 Gingerbread update starting today to a limited number of users.  The update will roll out to the remaining customers in the coming weeks and will continue until the end of the year.  Why so long to get the update to everyone?  I find this strange…does anyone else?

As reported by T-Mobile, the update provides the following enhancements and improvements.
New features:
2010 Exchange compatibility
New version of Swype
Android 2.3 (Gingerbread) OS
Improved issues:
Bluetooth® audio works better when answering a call from phone and Bluetooth is paired
Display is more stable and responsive during boot up or use
Domestic roaming data connection is more stable
Message inbox saves
Various software and stability improvements