This article by Carl Johan Calleman is a excellent preview and discussion of how the whole 2012 transformation may very likely transpire. It is a very eriudite and well thought out article worth reading.
Before going into the specifics of the upcoming sixth night, November 8, 2009 – November 2, 2010, of the Galactic Wave Movement (or Underworld) I feel I should clarify some of my basic points of departure for understanding the Mayan calendar, since the various ideas that are currently proposed for this vary significantly. There are for instance those that believe that the end date of the Mayan calendar only marks the end of a cycle and the beginning of a new. On my own part I however think that we are approaching something much more profound than just a point in a cycle that again will be repeated. The only Mayan inscription from ancient times, the Tortuguero monument, which describes the end (http://bit.ly/3Ni2rD) of their calendar says that nine cosmic forces will then manifest. Empirically, there is also overwhelming evidence from modern research that we are approaching a point in time when nine evolutionary levels (so called Underworlds) of the cosmic plan are simultaneously going to be completed. This would imply that we are approaching not another cycle or another shift, but the end to all shifts, which have been driving evolution since the beginning of the universe. Such an end to all shifts could conceivably provide the basis for a harmonious eternal peace on Earth.
The whole article is here: http://www.calleman.com/content/articles/nov8_sixth_night.htm