No, it won't. The claimed 2012 doomsday is a hoax. Everything the scam artists are saying about 2012 is a pack of lies.
The movie 2012 consists of unscientific BS that had been invented for the 2003 end of the world. It is fiction, and not even good fiction.
The Mayan calendar doesn't end, it just recycles. The Maya didn't predict anything for 2012. They didn’t make prophecies and the end of one cycle and start of another was an event to celebrate.
The people talking about all the signs of the end times happening now don’t realize that they have been happening throughout history.
The History Channel doomsday schlockumentary consists of lies, half truths, and wild speculation.
There were no ancient prophecies concerning 2012. Nostradamus never mentioned it. No one predicted it before the hoaxers started claiming it. This was after their 2003 doomsday failed to occur on schedule and they needed to keep selling their books and assorted doomsday garbage.
None of it is said or supported by scientists.
All the claimed astronomical events are either impossible or have no effect on us.
The Solar maximum is now expected to occur in May 2013 and to be less energetic than average. It could interfere with electronics and communications.
We aren't going to have any alignments aside from the apparent alignment that occurs every year at the December solstice.
Geomagnetic reversal (polar reversal) takes hundreds to thousands of years to occur. We wouldn’t even feel it happening.
Nibiru doesn't exist. It came from Z. Sitchen's misinterpretation of ancient Sumerian references to the planet Jupiter. Even Sitchen didn't claim it would come back in 2012 (he said 2085). Nancy Lieder, who hears aliens in her head and originally said her "Planet X" would be here in 2003) took over Sitchen's imaginary planet and changed her doomsday date to 2012 when her original prediction failed.
That covers most of the absurd claims. The world will still be here after 2012, along with most of us.