My favorite Zelda is A Link to the Past, but I'm a huge fan of Wind Waker and Twilight Princess too.
I think that if the next Zelda is marketed well, it could possibly sell the best out of all Zelda-games, passing even Ocarina of Time. That's about all I've got to say right now , but I might be back for more later.
Oh, and I think the next Zelda game will be released during 2009. Also, great thread, Khuutra :)