I have it on good authority that the New Teen Titans: Who is Donna Troy trade paperback isn't the only yet-unannounced DC trade paperback coming out in June. We also get ... Superman/Batman: Absolute Power hardcover! Hey DC -- THANKS!
And that's being solicited in March, when the "Absolute Power" storyline itself only ends, I believe in April -- that is excellent response time on DC's part. (That is, as opposed to JSA: Black Reign, also to be announced tomorrow, which is more than a year after the story itself.) I'm working on a timeline of the trade paperbacks (more info to come), and I'll be keeping an eye on the trade paperback release time as we go.
Apparently, this means we get Batman: War Games Act Two, JSA: Black Reign, New Teen Titans: Who is Donna Troy, and Superman/Batman: Absolute Power HC in June, leaving the Green Lantern: Rebirth HC, Superman: The Healing Touch, and Y - The Last Man: Ring of Truth for July. Looks good!
UPDATED: Looks like Superman/Batman: Absolute Power hardcover isn't coming out until July. Wonder why DC solicited it in June, but not any of the other July trade paperbacks ... weird ...