Yeah, historically (especially in the Modern Era) the large ticket items such as the '95 Falcon, '97 AT-AT and '99 Naboo Royal Starship debuted in August/September so that they would be in stores for the back to School shopping AND more specifically the Holiday shopping.
A $80-100 toy sells MUCH better in November as opposed to June. If Hasbro does give us a large vehicle like a Turbo Tank or AT-TE, I wouldn't expect to see it in the stores until Late Fall/Early Winter...
Jeff