I think canada creek may well be the site of the 2015 coaster
It has been rumored for years that they are planning something for the area, after all it's what, a log flume and a kids ride? Nothing else there! They could easily get some kind of sawmill themed coaster in there (*wishful thinking from me on the theme there) and they have a LOT of space in that area, don't forget all the places Loggers Leap meanders round!
I would also hazard a guess at them potentially looking at a hyper style coaster, using the out and back space as detailed above (well done that man) remember that they still own the land where the farm used to be, as well as the space where the train tracks went along to it before (I actually miss that train, some good memories aboard it and on the farm
)
With their recent penchant for record breakers and firsts, I think that the UK's first intamin hyper could be a very interesting move for thorpe no? especially given the relative popularity and success of similar coasters in recent times?
Whatever it is, I'm sure thorpe will pull something quite surprising out!