According to AllthingsD, who is sighting a source close to Apple, we seem to get iPad 3 in March. The event will be held at the the traditional Apple Product Release venue, Yerba Buena Center for Arts, in San Francisco. The actual product will follow up in a few weeks after the introduction.
So if you are wondering what the new tablet, iPad 3 going to be; AllThingsD says; "As for the next-generation iPad itself, sources say it will be pretty much what we’ve been led to expect by the innumerable reports leading up to its release: A device similar in form factor to the iPad 2, but running a much faster chip, sporting an improved graphics processing unit, and featuring a 2048×1536 Retina Display — or something close to it."
Beyond that we know that we might be getting a larger battery than the iPad 2 and we can be sure to get a better camera than the iPad 2. The recently revealed purported iPad 3 back cover suggests changes to internals, like the motherboard. Another change we could expect is the addition of 4G LTE, in AT&T and Verizon flavors, at least initially. In anycase get ready for a bit thicker and perhaps a cheaper successor to the iPad 2.