+Apocalyptic predictions
2012 is sometimes claimed to be a great year of spiritual transformation (or apocalypse).
Many esoteric sources interpret the completion of the twelfth B'ak'tun cycle in the Long Count of the Maya calendar
(which occurs on December 21 by the most widely held correlation) to mean there will be a major change in world order.

Accordingly, several eclectic authors claim that a major, world-changing event will take place in 2012:

X-The 1995 book The Mayan Prophecies linked the Maya calendar with long-period sunspot cycles.
X-The book 2012: Mayan Year of Destiny claims the Maya may have been instructed in their wisdom by discarnate entities from Orion and the Pleiades. Contact was maintained through shamanic rituals conducted in accordance with the movements of planets and stars.
X-The 1997 book The Bible Code claims that, according to certain algorithms of the Bible code, a meteor, asteroid or comet will collide with the Earth.
X-The book The Nostradamus Code speaks of a series of natural disasters caused by a comet (possibly as above) which will allow the third Antichrist to disperse his troops around the globe under the guise of aid in preparation for a possible nuclear war, although in the strictest sense it is unspecific as to nuclear war or some other natural or man caused destruction.
X-The book The Orion Prophecy claims that the Earth's magnetic field will reverse.
X-The 2005 book Beyond 2012: Catastrophe or Ecstasy by Geoff Stray reviews several theories, prophecies and predictions concerning 2012 and finds where authors have used faulty information or have bent the truth to fit their theories.
X-The 2006 book 2012: The Return of Quetzalcoatl by Daniel Pinchbeck discusses theories of a possible global awakening to psychic connection by the year 2012, creating a noosphere.

Other prophecies and apocalyptic writings and hypotheses for this year include:

?-Terence McKenna's mathematical novelty theory suggests a point of singularity in which a great number of things could happen, including "hyperspatial breakthrough", planetesimal impact, alien contact, historical metamorphosis, metamorphosis of natural law, solar explosion, quasar ignition at the galactic core, or nothing.
?-The Prophecy of the Popes, attributed to Saint Malachy, speculated that Pope Benedict XVI would reign during the beginning of the tribulation of which Jesus spoke, and sometime later a future pope described in the prophecy as "Peter the Roman", the last in this prophetic list, would appear, bringing as a result the destruction of the city of Rome and the Last Judgment.
?-Many new age spiritualists and philosophers ("new-agers") believe humankind will enter an age of enlightenment in 2012. There are a range of varying, generally positive, beliefs shared by a subset of spiritualists from the mundane to exceptional — including a positive social shift and age of peace, mankind becoming psychic and connected by a collective, and/or an evolution of the human race into non-corporeal beings made of "spiritual" energy, or light energy, i.e. 'ascension'.
?-Some alien-enthusiasts, along with some new-agers, believe 2012 to correspond approximately with the return of alien "watchers" or "caretakers" who might have helped the first human civilizations with developing their technology and may have been waiting for us to reach a higher level of technological and/or social advancement. Beliefs range from the extra-terrestrials having benevolent purposes — such as to help human society evolve — to malevolent purposes — such as enslavement of mankind and/or manipulation. [...]
??-the Nepalese ascetic Ram Bahadur Bomjon, the so-called "Buddha boy", reportedly told his followers that he would return around 2012.
??-Some proponents of a peak oil catastrophe place major events in 2012. Richard C. Duncan's book The Peak of World Oil Production and the Road To The Olduvai Gorge claims that the Olduvai cliff will begin and permanent blackouts will occur worldwide. Several studies predict a peak in oil production in or around 2012.

Originally posted by Skyfloating
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I even read the article you linked but did not find any indicator that this comet would be any different than hundreds of others.

... Robert Bast is a leading researcher and commentator on the 2012 meme