You can call it 5E. You can call it AD&D 3rd Edition. You can call it Robilard's Remarkable Roleplaying Relaunch. I don't care. If Monte Cook designs it and Paizo supports it, I'm good.
I think it will be a 5E coming with Monte's return. I can't imagine doing anything with less fanfare. I think they will try to create a version that will appeal to old and new gamers alike.
Whether that will be well-received, who knows. Marketing to us is like herding cats.
Regardless, I will definitely buy the set when it comes out just for collecting at least. Not sure if I'll jump in since I ended up making my choice with Pathfinder.
To those who argue that it's too early for 5E, remember that the PHB is D&D's cash cow. I think Hasbro, or any profit driven business, will slaughter it as often as they can.
It is a fractured market, and it is hard to market to us, but as long as we all by each new PHB, it pays off.
I play a Pathfinder/BoXM/House Ruled hodge podge that no one will ever publish. I'll still buy the 5E core rulebooks, and so will most of you. If 5E takes Pathfinder and pulls all the cool stuff (whatever there is) from 4E, while incorporating the kind of design philosophy Monte has demonstrated in Arcana Evolved, World of Darkness, and The collected Books of X Might, I will even like this new product. And I will steal ideas from it for my game I almost never get to play.
Kitsune, I believe you hit the nail right on the head, or at least where WotC should aim: the goal has to be to unify the fantasy RPG market again. Return to the OGL. Have Monte, Skip, Jonathan, Mike, Sean, Bruce, and Ari author a cohesive, yet versatile system that supports a variety of popular play styles, license that system's publication to Paizo, along with Dragon and Dungeon Magazines, under the direction of Erik Mona. Cancel 4E edition and all it's predecessors in favor of this new, somewhat backwards-compatible game. If the new game is better than 3E, but just as open, 3E will go away on its own.