Alpha Flight Classic Volume 3 Details
have gotten a look at Marvel's Hachette Book Distribution catalogue for the last third of 2012
and it features a listing for Alpha Flight Classic Vol.3 TPB which begins the Mantlo era of AF.
Listed for November, this is the catalogue for direct book store sales such as Amazon, Barnes & Noble, Borders etc. so Direct Market Comic stores usually have the books several months earlier though Diamond, so possibly an August or September release for this.
Also listed are the previously mentioned
Astonishing X-Men: Northstar HC and the Red Hulk:Mayan Ruin
(probable typo there) TPB