From what i understand, the AGPS in the mogul can only use gps while a call is in progress. The Touch on the otherhand, uses a different chip along with an antenna of which you can make out the outline, if you remove the battery cover.
The update scheduled for the Mogul in Q1 of 2008 is the same schedule for the Touch to get Rev. A, Picture Mail, and GPS.
I wouldn't doubt all you need for your Sprint Touch is the reg keys to enable GPS.
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