I don't know but I know someone who believes it's true and is preparing to, I believe, transcend, body and all when the time comes. She belongs to a group called Light Workers.
I'm new to this information and don't feel I have enough info on it as yet. I'm still practicing metatation.
But to know if anything that can't be seen is true you have to go within and seek the answer. I'm a bit sketical until it resonates as truth within. I'm not there yet.
The reason I joined absolute astronomy decussion group was because I came upon it while searching out the origin and meaning of
abakada, thought there would be a discussion on it.
I once while attempting to speak in tongues, many years ago, spoke many times, abakada and what I now know to be all the letters ie. ba, ka, da, ect of what I now know is an alphebet. It wasn't until today that I found out what it meant. Why I started saying this alphabet is still a mystery. But, I feel like one day the answer will appear to me as well. You just have to keep seeking and be open to it. No, I have never attempted to speak in tongues again.
Perhaps my story has helped you in some way, if so I'm glad. I was reading an interesting article earlier about the Great Cross of Hendaye at esoterism.ro, and in the article they address your curiosity about 2012 and suggest that we may hold the power to prevent this destruction and what they think we should do. Nice talking to you. Light and Love, 'D'.

The earth is already vibrating in the fifth dimension...
for time to time, I myself have manage to do the same...but it is a lot of work and responsibility to stay in it.....
it can also be very disorienting and can overwhelm us if we are not prepared for it.
right now I am in and out daily....when I in it I feel so much joy, oneness and connection to everything.....but when i'm not, it can get very depressing.
This is natural....just got to ride the waves as they come.
my first experience in the 5th dimension took place in august of 1997.
until that time i wasn't even aware there was such a thing.....
it's been a very interesting journey

I believe everyone of us are already in the fifth dimension. We are five dimensional beings. Thought being in the relm of the fifth. Here is my proof. Imagine yourself in orbit around the Earth. Now take your imagined self outside of the solar system. Now keep going past the Milky Way, past the local group, past the super cluster of galaxies and on untill you are percieving the universe "below" you. Now where could your mind be? - The Fifth Dimension.
A tesseract is a two dimensional representation - a projection of 4 dimensions onto 2. DNA (and therefore proteins as well) is a projection of 5 dimensions onto 3. In my opinion of course. Its just a theory or hypothesis to be correct.
Jim's instant theory-just add beer ;)