From the data in the photos, which contain the output from an iPad 3 using a development and debug tool called iBoot, we can infer plenty of information about the upcoming iPad 3. [...] The new processor will also apparently be a quad-core model, making the upcoming iPad 3 the fastest iOS device ever, we have been told.
The veracity of the data is, of course, uncertain. Previous rumors have claimed that iPad 3 production has started, as well as Foxconn issuing plans to build 5 new iPad production facilities in Brazil.
The A6 chipset noted in the debug tool carries a model number of S5L8945X with the iPad units themselves carrying model numbers of J1 and J2 (iPad 3,1 and iPad 3.2 respectively). This falls in line with what was uncovered in iOS 5.1 beta code. The rumor calls for one model being WiFi-only, and the other adding full support for LTE/CDMA/GSM. This should allow for Apple to release just one SKU across data-equipped iPad units for all major carriers, rather than a special LTE model for the limited markets that currently support it.
As far as rumors of when the iPad 3 might hit the streets, speculation of a March 2012 seem likely with Apple sticking to their historical release cycle, but we won't know for sure until Apple makes the announcement.