I called T-Mobile via 611 this morning to inquire if the free battery upgrade was going to happen and was transferred to Blackberry/PDA support. The rep I spoke with did confirm that the manufacturer (whoever that is - HTC?) will be sending out a more powerful battery for free to T-Mobile's G1 customers. She did not have a target date for the shipment.
In the meantime, T-Mobile is sending me a new, regular battery. Santa did bring me a docking station with the ability to charge an extra battery, so this is a very welcome addition. Last night I was at a lengthy concert with no ability to recharge. I was not using the phone for photos or "fun" stuff and eventually just shut it off in case I needed to make a phone call later.
I rarely turn on GPS or Blutooth. I am looking forward to the stronger battery.