All of that could be down to Sean himself. I get the impression that this is show is more about broadcasting the 'Sean Alexander' show to the public, than a new show for the park (nothing wrong with that all). He wants the word to spread about his 'product' what he offers and no doubt he's using PWH as a stepping stone and will eventually go on to bigger and beter things.
I would like to see a new show for 2013 just to keep it interesting, look at legoland windsor, they've had the same diving show there for years, and it just seems a bit stale.
That's expected really. You have to think, they probably only do about 5/6 tricks during the show. So change them each year and you can then advertise a new show!
I must say, when I have seen this show this year, it has been a bit dissapointing compared to last year, although he does seem to have more technical issues, the show seems to be a lot slower than last year's.