Open table for sure, you will be able to go absolutely crazy with battlefields due to the other-dimensional nature of the game, so you can have floating terrain and stuff that would defy (our) physical laws but is totally ok in the Ether. I've left it open ended so terrain builders can really do whatever the heck they want, no matter how weird or crazy.
Movement will probably be standard, I did try doing 3d movement with bases that can be adjusted using jacks, but it just didn't work out well at all and wasn't feasable! There is a lot of weird otherdimensional stuff, especially with the Commanders.
I suppose you could have tables in space to, but space is white, the inverse of ours, with stars of blue, purple and pink. Allthough, that said there is an area called "the shattered lands" where cracks lead to other spaces and cause all manner of anomolies so I suppose you could have normal black space "spilling" in too..