Preview at WWDC likely in June, followed by September launch.
iPad 3 Media Event Planned for Early February?
According to asian supplier and a source in United States, Apple seems to prepare to hold Special Event in early February.An approximately one-month gap between introduction and availability would be significantly longer than for the iPad 2, which was introduced on March 2, 2011 with availability coming just nine days later on March 11.
Because Chinese factory will be in holiday of New Year, then new product is concidered to be released in early March.
The original iPad didn't launch until more than two months after its January 2010 debut, although Apple tends toward longer gaps between introduction and launch for new product categories in order to accommodate the regulatory approval process without risking leaks of product details.
Mac Otakara has had a mixed track record in the past, but the site's most recent report regarding the start of iPad 3 production ahead of an early March debut was corroborated by Bloomberg just a few days later.