Nintendo WiiU is fully out, and all the information is available for it.
Sony is releasing information about the next Playstation on the 20th of this month. They probably will focus more on console features, launch games, and the console/controller appearance, and gradually release the technical details in the month following that. Or, if it's super impressive, they will just release it all in one blow as a surprise.
The next XBox won't have any information released until E3 probably (which is June), but Microsoft may bump up their revelations sooner because of Sony's earlier-than-expected announcements.
It probably won't be until the end of 2013 that you will get the exact details you want, when the PS4 is already released and the XBox Next is already released or about to be.