Soarin' and Test Track were our favorite new rides since our last visit. Soarin' seemed to be extremely popular. While other big rides had no wait (Test Track, Mission Space), Soarin' had a 50 minute wait. We rode early in our trip and had no problems with lines or fast passes late in the day. The day before we left (Dec 18), we tried to ride it again. The wait was 120 minutes and they were out of Fast Passes (It was before noon).
As for motion sickness, my wife and I both have problems with it, her more so. Back to the Future at US was the worst ride of all time for us. At Disney, I liked Mission Space but it made me a bit upset. She nearly had an all out panic attack and felt horrible afterwords. BUT, we both loved Soarin'.