However, yes the habit is not a secret anymore. Apple has that habit. In this case, the company has leaked and also confirmed about the iPad 3 via its iOS 5.1 beta 2 which is recently released.
And of the TUAW blog authors,Kelly Hodgkins, did a little research by digging into the 5.1 beta 2 and found the iPad 3 reference, and she believes the find it's reliable. This is what she says:
What Kelly found can be added as more references to support that Apple is allegedly to launch iPad 3 in the next 4 months!