4.3 - Where's all the stuff?

So the preview release is out, and I’d like to know 2 things.

First, where is the world browser? I created my map with it in 4.2 and now I can’t find it anymore, all there is is this new Tile Map Editor which seems to have 0 functionality. I can’t find anyway to load my tiled world back up.
Second, I can’t find the integrated speed tree. I thought 4.3 was suppose to have speed tree included.

Is there some key-combo I must do to unlock the new features :P?

Please dont create duplicate threads. I’m closing this one.