A neat twist, a few things we didn't know. What I feel ripped off about is that there was supposed to be a revelation about an Island mystery related to the mythology of the show. If there was something major I don't think I caught it.
Either way, here's my spoiler:
One other great twist at the end, as usual I yelled at my t.v., but this time instead of yelling "WHAT!?" or "NO FREAKIN' WAY!" I yelled "YES!" because it redeems Nikki and Paulo in my eyes, tenfold. Thanks for that moment, guys, it's going to take a week to get the smile off my face.