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StarCraft II: Wings of Liberty, the first of three SCII releases, will have a full single-player campaign centered on the Terrans. You'll get a chance to putz around with the Protoss, too, though.
"I won't go into details, since we don't give out information on the campaign of StarCraft 2, but I can confirm that there will be a Protoss mini-campaign that lets you control Protoss units," states Blizzard on the SC2 forums. "This part of the campaign mode is of course way shorter than the Terran part, but it is very fun to have a very different playstyle to add even more variety to the game. I am sure every Protoss fan will love this part of the Campaign!"
"That being said, the Protoss mini-campaign will not prepare you for the multiplayer as Protoss, you won't be using all units or getting to know buildings and upgrades. In general, even for Terran, it is not the objective of the singleplayer to show how to play the game effectively, it is to tell a story and do a lot of fun things, that would not be possible in multiplayer. The Challenges, mini-missions, that ask you to complete a very specific task, are more suited to give players the opportunity to learn how to use the units and how to play the game."
Wings of Liberty, which also includes the full SC2 multiplayer component, is expected in the first half of 2010. A beta will be held beforehand but as far as we know, invites haven't been sent out yet.