Media event set for September 9, launch likely ~10 days later.
Apple's Back to School Promo Kicks off June 3rd
The exact offering for this year's promo is not yet known, but is expected to be comparable. Qualifying students looking to buy a Mac should certainly wait until June 3rd to take advantage of the promotion.
Last year's promo page remains online at the Apple Store, but terms and conditions will likely be different for this year's promo.