2012 is just another conspiracy... What's worse, is that something happens every year, whether it be a hurricane or an earthquake, and all these people are going to go saying how they were right.... Yeah, coincidences will happen.
UFOs.... I don't think there are such things, to be honest, though I do think there are aliens somewhere, but not necessarily intelligent. Based on how few "intelligent" (by modern human standards) species there are on earth (count 'em: 1) that still exist, I see no reason why aliens aren't just going to be closer to our every day insects. Who knows? With thousands of galaxies, there must be other life somewhere, though the biggest question is: will we ever reach them? The nearest star system is still light years away, something humans cannot hope to reach in our lifetime with current technology, and to be honest, traveling at light speed isn't something I see happening...
We are either alone in our universe, or we are not. Both theories are shocking.