The first DC Comics book, DC ADVENTURES drops in August 2010. Three subsequent books detailing heroes and villains will be released later this year and in 2011. Mutants & Masterminds 3rd Edition will use the same ruleset, and be released in Fall 2011.
At the same time Savage Worlds Super Powers Companion is now available in print (it had been out in PDF earlier this year).
It's a great one-two bunch. I've enjoyed both games tremendously, and my gaming group had a lot of success with Mutants & Masterminds in our Infinity Storm campaign. Unfortunately, while we had fun with the game, it proved to be too crunchy for much of the group. That's why the Savage Worlds Super Powers Companion is so appealing; it has the potential to be a simpler. Like M&M, it allows you to purchase powers using a point-buy system, but the rest of the system -- skills, edges, hinderances -- remains the same.
I'll still get M&M 3rd Edition, if for no other reason than I personally like the system, and hope to play it again at conventions and I'll likely pick up one of the DC books. DC Heroes was the first supers game I ever played, and nostalgia has almost as strong a pull as Superman. That said, what I really want is for Infinity Storm to get off the ground again, and if playing Savage Worlds is what it takes, them I'm fine with that.