I’ve heard all kinds of dates. Here is a sample from Macworld UK: Speculation regarding a new iPad 5 release date is rampant at the moment, but we do expect a new iPad 5 model to be released at some point in 2013.
What I’ve heard is the new iPad is supposed to be released in April but Apple hasn’t finished updating their OS 9.something which they don’t expect until this summer. I don’t know if the new iPad is contingent upon that software or if the software is supposed to be for their computers?