Should I wait to buy a new MacBook Pro?

Hello all I am in need of a new computer and have settled on getting a mbp. However I have heard many rumors of new ones coming out very soon. School starts the 24th of septemberand I would like to have one by then but am able to wait another month if it would be worth it. Also they have the free ipod deal right now which would be nice but if upgrades are worth it I can p on that. For now I'm waiting till septmber 14th to buy (when the free ipod deal is over) but am not sure what to do if that day comes and no announcements yet on new computers