Summer of Arcade 2012 begins on July 18 with the HD-ified rebirth of Tony Hawk Pro Skater for 1200 MS Points ($15). The following week, Iron Galaxy's Angry Birds meets Boom Blox Kinect flinger Wreckateer arrives for 800 MS Points ($10), with Deadlight, Hybrid, and Dust: An Elysian Tail launching in the subsequent weeks, all for 1200 MS Points ($15) a pop.
Microsoft is offering an incentive (as always) to spur multiple Summer of Arcade purchases, giving those who snag "any three of the above titles" a free 400 MS Points ($5). From the look of things, that won't be too hard a sell.
Additionally, Tony Hawk Pro Skater HD is heading to PlayStation Network "a few weeks" after it launches on Xbox Live Arcade, but the rest of the Summer of Arcade games are exclusive to 360 (at least for now).