I also don't think they're implying a romance between Gandalf and Galadriel. I don't know what they're inferring actually, save perhaps Galadriel divining Gandalf's true spirit in a flashback scene.
One thing I'm really looking forward to: we will get to see dwarves kick some ass. Those who haven't read the books will see that they're not comic relief but are damned kickass
(in Unfinished Tales it's said that while Sauron assaulted Minas Tirith in ROTK, he also assaulted The Lonely Mountain and Esgaroth in another major battle that we didn't see. And in The Silmarillion dwarves kicked the crap out of elves)
EDIT: Radagast is in the movie

http://www.imdb.com/title/tt0903624/fullcredits. So is Elros which supports my theory that the Galadriel and Gandalf scene is a flashback.