An update on the Frontier City situation: soil testing drills have been spotted in the old Six Flags HQ parking lot on the very south end of the park outside Wildcat's first drop. There are markers all over the parking lot including a stake that is on the other side of the lot by the roadway. This is a prime piece of land for a showy attraction being right next to the roadway and in front of everything, and it's large enough yet out of the way enough that they're either going to put a coaster here or they're making new area of the park. There's a photo here (I don't have permission to repost yet): http://sdcfans.com/forums/index.php?topic=1380.msg36423#msg36423
This actually has me excited. If they were going to go with a basic flat, there are other areas in the park I think they'd put it. This piece of land seems like it would be reserved for a coaster, especially with Burke and Story behind the scenes now. I could see an euro fighter 420 working perfectly here.