Interesting that a couple of operators have mentioned a coaster coming next year, and that the TGS area has been mentioned so many times. I don't usually put all that much stock in what employees say, because rumors do get passed around among them that may or may not be based on fact, but SDC and DW employees have always been surprisingly accurate with their knowledge of coming attractions. We've found out about Wild Eagle, Barnstormer, TGS, River Blast, and probably loads of other attractions that I don't remember just from asking ride attendants.
Like I've said before, there's a nice ravine down from the old robbers shack that would fit a terrain wooden coaster very nicely. It would be odd to wind a path around there, but with enough dirt moving and a tunnel over the train tracks it could be done. Perhaps the station would be where the shack is, and the tracks would cross over the train.
I still see them using the WB area for something that is more suitable to flat land rather than the wooden coaster that we will hopefully get soon. An Adventure mountain type attraction would fit in well there (themed appropriately somehow - perhaps a tree top logging sort of thing?) or just more shops and soft attractions.