At first glance, it's nothing more than an off-hand comment by Blizzard's Rob Pardo on the World of Warcraft forums.
But, if you decide to cut it into a thousand tiny pieces and analyse it like a slobbering SC fanboy, you could come to the reasonable conclusion that we'll be seeing Starcraft 2 sooner than the second World of Warcraft expansion, Wrath of the Lich King.
No, it's not a date. And yes, it could mean we'll have SC 2 89 years from now and Lich King in 90 years.
My less sarcastic guess? Middle of next year.