First of all, those new tilesets (and the updated ones) look amazing. They remind me alot more of the look that Starcraft 1 had. So thats great. Much better resolution, aswell. The terrain textures in Starcraft 2 were always so ugly because of these weird shading effects Blizzard put on it. Now they seemed to have resolved that.
And before you all get your pitchforks out: Your maps that use the unupdated tilesets PROBABLY will not change. Instead, they will simply be listed as "outdated" tilesets that can still be used and wont be replaced. It was the same for Hearth of the Swarm, too. Hopefully. Otherwise, Blizzard fucked up. They shouldnt just force changes upon custom maps.
While I'm not one to whine on 'old vs new', I wonder if Blizzard would let us use both, if we were interested. New ones joining with old ones, vice-versa, to create more varied terraining, y'know?
/edit The only thing I can say something about is the Ulnar tileset. Sounds a lot like Alien Korhal to me, honestly. The rest, are impeccable and, as I stated repeatedly, the core reason of why I bought LotV in the first place.
True, but still we oughta master how to divide between zones effectively and stuff, because there's still the border issues with the texture sets, to not mention each 'zone' is 8x8, and that's considerably big, favouring more horizontal/vertical zones than diagonal.