I like the idea of cobras too. As of my knowledge it's the only unit that can move and atack at the same time. If it were a "copy" of some existing unit then I would agree but why remove it from the game if it's unique?
The reapers are pretty weird with their jump jets, but protoss also have hard dragoons. At first I thought that high-ground and islands would present no advantage now with these abilities. The truth is that nothing's really changed with the jump jets (vulture/marine + dropship = reaper). The mines are something else...but I'm 100% sure you can protect yourself against them.
One more thing: I WANT TO SEE ZERG!
