If you’re an existing T-Mobile customer and you pre-order the MyTouch 3G in between the July 8th to July 28th timeframe you’ll have your MyTouch 3G by August 3rd! T-Mo makes it very clear that this is before everyone else, so it is likely that it won’t hit retail until at least a few days later.
This update comes in a T-Mobile email about the MyTouch:
The pre-order starts in less than a week and the first customers will get theirs in just over a month!