I have actually looked into this and studied this in college, I had to write a theory on it. All the research I have done, and personal emotions have lead me to believe that only the world as we know it is going to come to an end. This doesn't mean the world is going to end in chaos and the earth will be destroyed, but by the year 2012 we're going to experience something so extrodinarily fantastic that its going to shift our conciousness to the next level. I am positive that we are going to experience a transdimensional step for the first time in a very long time. This would mean we are actually in the process of slipping into the fifth dimension.
I honestly believe we are in this process with transdimensional beings as our guides, but they affect us indirectly because we are not at the breakthrough we would be at in 2012. I've studied dialogues and dialogues of text and the last time we experienced a shift of concsiousness was when man started using his vocal chords instead of communicating through body motions. I believe what started this was when our ancestors in the evolution time line picked and ate psilocybin containing mushrooms or other hallucinogenic fungi such as the amanita-muscara. This fungis opened up our innner eye (our mind's eye) and lead us to see the world in a different way.
I don't believe that the mushrooms that grew back then and the mushrooms we manifest today were an accident. They were put there by a transdimensional or devine being so that would could evolve into what we have come to be today.
This global shift of conciouness is going to work as a process, we've been working up to this point in history with little baby steps. Now its time for this whirlwind of events to take place. Our shift into the 5th dimension will fly in because our minds are being linked, slowly but surely. We will begin to know stuff that hasn't happened yet, we will be able to communicate via extra sensual perception. After this happens the transdimensional beings can come through, greet us, and harminize with us, wether they be extra-terrestrial life forms or spirits. To a lot of people this would be catastrophic, and people wouldn't know how to handle it because what they were living will seem like a lie, all of their material wants and objects will mean nothing. This is why we are going to take baby steps until 2012. From then on we'll move into what I'll refer to as hyper speed, we will just be flooded with loads of new information, get in touch with our inner being or spirit, and most importantly we will live for the society, no more living for your own selfish needs.
I didn't read any of the links people have put up about 2012 and the truth. I refuse to. I refuse to on the basis of which I know what is going to happen, I have seen things that none of you would imagine possible. If you want the real truth I highly suggest you read 2012: by Daniel Pinchbeck, or read some Terence McKenna. If anyone wants to learn more but directly from what I know feel free to ask in a reply or personal message.