Flashback. Jason Dies. Superboy punches really hard. Jim Aparo wakes from the dead to bring back Jason. Jason is buried alive, digs his way out, is raised by wolves, er... Ras' and Talia, is pissed that Batman never avenged him, takes a dunk in a Lazurus Sauna, schemed with Hush to mindfuck Bats using Clayface, and now he's back.
Kinda like everything they explained in Batman 650, except fleshed out.
Still lame.
Spoilers.