"John Cleese (as a fake mad scientist who goes around stealing everyone else's ideas.)" Have you actually watched the film or bothered to check the IMDB page? That's Eddie Izzard's character. Cleese's character dies fairly early in the film.

This seems especially odd to me, since Gargamel has the ability to make normal blue smurfs. That's where Smurfette came from. http://en.wikipedia.org/wiki/Smurfette

io9 had an article about that a while back: http://io9.com/5530230/terry-pratchett-explains-why-doctor-who-is-ludicrous

The earlier material said this episode would have more non-CG Daleks on screen than ever previously seen, including pretty much all the previous types of Daleks. I think it'll be pretty cool, though I dunno about the scary bits.