

Volume production is expected to start in February and reach 9.5-9.8 million units in the first quarter of 2012.OEM production of iPad 2 will remain high at 14-15 million units in the fourth quarter of 2011 but decline to 4-5 million units in the first quarter of 2012, paving the way for the launch of the new iPads, the sources noted.
March or April should come as no surprise to regular Apple followers. While Apple first announced the original iPad in Jan 2010, the company didn't start shipping the first units to customers until April. In 2011, the iPad 2 was announced around the same time of year.
The iPad 3 is widely expected to carry a high resolution "Retina" display.
Article Link: iPad 3 Expected to Launch in Around March-April