We announced today that the park is removing Wheelie to make room for SkyScreamer in 2013.
Here is the press release with more information:
I know you guys never like to see parks remove rides (we don't either), but at some point, rides pass their expected life and, due to a number of reasons, must be retired. We are excited that we will be replacing Wheelie with another exciting thrill ride that will be a family favorite just like Wheelie has been since 1977.