not being a long time Mac follower I will find it interesting if they release a new version ipod while there is a promotion for a free one for all education staff/students/etc... I would imagine they would wait until the promotion is over on Sept. 16th to release something new. Maybe they won't offer it as part of the promotion but that might not look really good. "Buy a Mac get a free Ipod!!!! (but not that one!) I am getting ready to pick up my first mac and may wait until the 5th just to see.
You get a free iPod Nano in the promotion, so the 5th is a strong possibilty for the touchscreen iPod release. http://www.apple.com/backtoschool/?cid=WWW-NAUS-BTS20070525-BFSKC&cp=BTS07-APL&sr=apl