They don't do things like that. It's top of the morning on promos. Avoids the angry parents that were there that morning and didn't get the whatever.
Frankly I wouldn't be surprise if there is no summer wide promo. The computers are selling just fine without it and they can just stop promotion early to avoid overflow. Heck with the earthquake in Japan they might not have as many components to build touches anyway.
What would probably be more useful is a general move to better discounts. They upp'd the white macbook from $50 to $100 here in the US. Why not bump all the computers up a level. Make Apple Care a flat 50% off its cost. Maybe even open up the student thing to high school kids (if they can show a dated photo id from their school or a letter of some time with the date and name etc). perhaps even toss out a little 2-3% discount on things like airports, power plugs, even ipods and ipads. That would be better for many students and their parents than a free ipod they probably actually don't need cause they have 5 already (or an iphone)