I'm buying it.
Anyone have a question or two, since I'm playing the Beta? I'll tell you right now, it DOES feel like StarCraft. But while it feels the same, it isn't - there are a ton of new strategic options, but they don't make the game feel alien or weird. It feels like a StarCraft II game ought to feel, really.
Terrans for example, if I go gas early I can build a Barracks, then build a Factory while my Barracks builds a Tech Lab or Reactor add-on, and fly my Factory to it and start pumping out Tanks without needing to wait for an add-on once the Factory is done, I already have the add-on ready for it. Protoss too, there's a lot more power to them to build a proxy pylon now, with Warp In allowing you to keep the Gateways at your base but still proxy the opponent with a pylon or two. Cy Cores are cheaper by 50 minerals allowing quicker anti-air options (Stalkers cost the same as Dragoons, 125/50), and since Cy Cores allow Warp In you have a lot more incentive to build on earlier than before.
I have to say that Vespene Gas feels like a more expensive option to take, especially early on. Geysers are now two per base with 2500 a geyser, and workers harvest 4 gas a trip. So overall you still have 5000 gas per base, and with three workers on each geyser you still earn 8 gas a trip combined, but you need to use six workers, not three, to mine optimally. As well, the Gas producing buildings cost a bit less than before, but because you need to mine both geysers to mine at optimal capacity it ultimately costs a little bit more since you need two instead of one.
The new features like auto-mine, idle worker button and pop-ups about a unit/building/tech finishing help a lot. You don't need to focus so much on checking every single building to see what's happening, you get constant updates along the left side of the screen. I feel more free to focus on building up my forces and attack without needing to monitor my base all the time. I'm sure for veteran players these new features don't add much, but for me, a casual, and I admit, lousy player, it helps a lot.