Thought I post some feedback from my experience.
-I can’t seem to rename folders for some reason. It’s greyed out, unselectable. Is this a bug of some kind? Would be wonderful if we can do this.
Also some bugs and feedback in case someone is interested.
-UDK will crash if your .fbx file name is the same as a texture node within your Maya files. I was crashing because test.fbx includes a material with test.png. I had to rename my textures to test_D.png to solve this issue. Generally not really a bug but just in case someone was having trouble. It’s better to have unique names for everything including texture files.
-Mouse inversion? This still carried on from UE3, not really that bad but it is a bit tricky when my mouse orientation can’t be inverted to match my preferred software. Would be wonderful if we can get this feature in UDK.
-Content deleting is a bit tricky. Sometimes it tells me asset is in use, other times it allows me to delete without much trouble. Not sure if there’s a work around for this other than keep deleting until it gets deleted 
Anyway that’s my feedback so far. Loving UE4!