Well, I don't know if realities created by Mr. Mxyzptlk and the Joker can be considered part of the DCU propper. Besides, I think we might have to see what happens to Damian after Ra's Al Ghul returns.
I haven't been following along, what are DC's 52 new worlds? Is this a temporary thing or is the Multiverse truly back?
They haven't all been established yet but the Multiverse is definitely back. At least until Final Crisis, that is.