Bumping this thread because there have been some developments over the past few months. First off, check out this awesome gameplay demo. I'd advise you to not wear your best pants, as you will probably cream them.
Gameplay Video.
Man I love this video. SPOILERS (lol I know): I'm very surprised that the Terrans won because the Protoss was able to apply so much pressure early on. But I suppose this goes to show how adaptable Terrans are overall as a race because even though the Protoss had more expansions going on the Terrans were able to recover more and overwhelm them with basic Mauraders while I think the Protoss probably spent a little too much on those Colossus.
Anyways, there has been a lot of important news coming out. The big one being that there has been a decision to split SC2 into three games, each one featuring the campaign of a race. The first one being Terran. I'm not sure how pricing will work, but each part is going to have the equivalent of an entire games worth of missions (the original SC had about 32, the Terran expansion for SC2 has 30).
If you look into the website, google, search around, etc you can find the interviews which have more information.
Overall I'm pretty confident in Blizzard which never fails to turn out a good product. On paper things may sound bad but seeing that gameplay video has really rekindled my love for SC, so I suppose we shall see.