I stopped in to my local T-Mobile company store the other day to take advantage of the 50% accessory email I received. I picked up a new case and screen savers for my G2x.
I noticed a G2x on display in the store... supposedly all of those had been pulled. I asked the sales guy if they were selling them... to my surprise he said, "yes, we have stock and are selling them". I also asked him if he knew when GB was coming out for the G2x and he told me he wasn't allowed to disclose any release dates for any updates. No big surprise there. But what he did tell me was "not to worry, it is being worked on and will come out as advertised".
Something else he told me was to get a App Killer for my G2x. What they found is that the device is running too many Apps in the background which is what is causing the shut downs and re-boots. I never thought of that. He is running an App Killer on his and never has any re-boots. He also hinted that when GB does come out for the G2x it will be running fewer Apps in the background and will also speed up the phone.
I have been working with the guys in this store for years and honestly trust the information they pass along to me... as much or little as they can. Personally, I viewed what he told me as pretty positive.