Lending further credence to these reports, Jim Dalrymple of The Loop has chimed in with his affirming "Yep," thereby ostensibly confirming the event.
Regarding the device specifics, Paczkowski writes:
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.
The alleged specifications confirm the seemingly endless slew of iPad-related rumors of the past few months, with the iPad 3 most notably set to boast an iPhone-esque Retina Display.
Paczkowski offers the fitting conclusion:
If 2011 was the year of the iPad 2, will 2012 be the year of the iPad 3? Said a source familiar with the device: “What do you think?”