Odds of Maxis adding create-a-world like sims 3?

I think it's very unlikely that we'll get a tool like the one in Sims 3. But I do think they could at least give us an empty world like Newcrest and let us choose the terrain paint, add some decor like trees and rocks, and choose the background and the name of the world.

Kinda like modders did turning Forgotten Hollow into a chinese world.

Or they could realease a set of pre-made worlds and let us decorate it, like it was in The Sims 2.