StarCraftWire.net has come across a printout of "Upcoming Games Releases in Singapore" for the next few months, and it shows StarCraft 2 to have a date set for a 1st quarter release in 2009.
Considering what we know so far, this is not an impossibility in fact, and the fact that several other titles are under "To Be Decided" (TBD) status of this Singapore-specific release schedule would imply that it's not the standard type of print, where retailers just set a date so they can add it to their systems.