Thor is a new Terran mothership? I guess we won't see any thors in the final expansion then.
Well, yea, kinda weird with terrans. They get two new units (Battle Hellion is more of Hellion ability to slow speed and gain more armor)... one of them is kinda like a defensive unit and other kinda like repalcement for Thor/Goliath. So... yea.
Protoss won't get Mothership, but some of it's abilities plus one more belong to Nexus now... heck, that's even better actually. Now, a caster unit which looks pretty good for harrass and a replacement for carrier, well, I say it is kinda unfair with them. Oh wait, the replicator... so no, they're all fine. Zerg... so yea, new caster which is so much better than Overseer, and some new and immproved-ish Lurkerr... alright I guess. But I hope Zerg will get something else new too. Some new ability for some unit or whatever.