Haha, Starcraft II is far from being released yet. Still in the works.
As for Red Alert 3, it was rumored to be in the works a long, long time ago, but ever since Westwood Studios was completely acquired by EA, the focus went on to the Generals series and now C&C 3: Tiberium Wars. I'm pretty sure they completely canceled it, although I wouldn't be surprised if they decided to resurrect it like they did with Tiberium Wars.