So I put about an hour into the beta doing two 2v2 matches. I've played the Terran and Protoss races now, and as usual, I sucked as Terran (I was always bad with them because I don't like their tech tree) and I did decently as Protoss.
It's still very much classic Starcraft kind of gameplay. That is -- expendable units and fast gameplay/rebuilding. So I guess if you loved Starcraft in the past than this is just a revamped version. The tech trees are similar but more complicated this time around. Lots of new units that I wasn't really able to look at so I'm still unfamiliar with how to tech up and use each unit's abilities and stuff though.
Also, the game runs pretty well. I'm playing it on my laptop which has a Geforce 7400 Go, so I had to turn down a lot of the graphical settings but it still looks reasonable (not great though).
The maps have limited resources (so no big game hunters yet like in the SC) so you're forced to expand and play a little more strategically, but rebuilding is still very fast. In my second game as protoss, my main base almost got wiped out but I was able to amass multiple large armies of Zealots and Sentries and mounted a strong offensive against the enemy. My ally decided to tech with these heavy aircraft and was able to save me from the attack on my base.
All in all, it's shaping up to be a good game. It is just somewhat surprising how long it has taken them though since this game has been in development for a long time and the results don't seem to justify the extended length of time it has taken. At least, from the beta, it doesn't seem like it yet.