Nope, but it could be anytime.
Even, March 2008, since Silverwood could choose to install it anytime during the 2008 season, but most likely for either the beginning of the season, which I assume is around March, or possible peak season, like July-August-ish.
Or, Silverwood could choose to be like Joyland, and just keep Deja Vu in storage indefinitely, like Joyland has done with GL.
Then again, this is just spec.
So, nothing official, yet, just that Screamspace sources have "confirmed" that the GIB will be going there.