No spoilers were given of course, but Ben was asked if anyone's theory had guess right to the mysteries of the show. He replied that he doesn't know the ending but the writers did say that they read a correct theory but it's so buried with so many other theories that people won't know which one is correct.
So maybe someone on Lostpedia got it right? I guess we'll find out in 2010.
(No more blogging down people's theories now because the writers haven't given enough info)