I didn't like the new song either - or the renaming of 'Bad Street Theatre'. There's no real reason for either of them to be changed.
As for guests I'd also love to see Anthony Morgan, Amanda Keller and definately Pinky - just because he is so awesome in every possible way. Others include Tim and Rich (especially after rewatching the episode where Tim completely threw that game of 'Magazine Mastermind'), Julia Zemiro, Adam Spencer, Rhys Muldoon and all those old favourites.
Also found that second Jensen ad where he pushes Paul. No luck on the bloopers one yet though Channel 10 has put up an extra clip of Jensen on the show tonight on their Supernatural website.
http://ten.com.au/ten/supernatural-video.html