According to the reports Apple will be launching iPad 3 on March 7. All Things D released the report last week which cited an early March release which also fits with the release schedule of previous Apple iPads. Several sources including iMore and The Loop are in agreement on the release date being set for March 7th, both being prominent sources for previous Apple leaks. If previous sales are to repeat themselves the iPad 3 should be announced on the 7th and then be found in store in the US by March 16, a Friday. It should then become available for sales internationally by March 30th but these are not confirmed news at the moment.
According to All Things D, the event will be in San Francisco, probably the Yerba Buena Center for the Arts, the regular location for Apple launches.
With regards to specs, the Japanese blog iLab Factory says that the device could be measuring 9.7 inches diagonally, with a resolution of 2,048 x 1,536 pixels, or four times the resolution of the iPad 2.
All Things Dalso reports that the next iPad will have a faster processor (the A6), with a higher-resolution display and improved graphics with 4G LTE networking.