If they were remotely imminent we would have heard about them. The last we did hear was along the lines of "x-server is too hard, here - take massive servers instead". I'm sure the feature will exist at some point in the future but I'm also sure it is at least several months (possibly years) away.
I'm hoping it will be included in 2.4 -- along with 3+ new WZs, new WZ maps, arenas, and an actual start to Season 1. (At least, cross-server for Ranked).