August 22 - 26.
Didn't Phil say that all they were waiting for was the FCC thing to clear up and then preorder would be able to begin as if to hint soon after? The tweet from him saying that everything required to being is all in order except the go to begin pre-order? For me, if he's good to his work, they won't wait roughly a month to begin preorder. There is no reason to hold off if you ask me. Those interested will order now, and that will help them to properly gauge stock needs and interest. Adding bundle announcements means more SKUs and would kind of mess up pricing and production allocations.
If they will do bundles, then they should hold off until Gamescom, if not, just get it going as soon as possible and announce other things at Gamescom.