I don't like this. By trying to combine 4e and pre-4e cosmology, it feels like they're diluting everything.
The thing I like the least is how they're keeping the planes from the great wheel that are inimical to life, like the positive/negative energy planes, where you pretty much automatically die if you go there barring the protection of some pretty extreme magic. Those planes always felt so completely pointless to me. It's about as useful as traveling to the sun. Even if you had a spacesuit that let you survive, what's the point?
And do we really need 3x4 elemental planes? Why can't the "elemental chaos" just be a single plane with many different layers and variety of locations, like, you know, any other world?
And making Ravenloft the opposite of the Feywild just really bothers me for some reason. And I don't understand all of the Spelljammer hate. If people don't want to include that in their games, they won't. I've never once played in any DnD setting where Spelljammer got in the way.