According to the GameStop website, the release dates of Batman: Arkham City and inFAMOUS 2 have been revealed. This is, however, neither confirmed or debunked leaving these rumors true.
GameStop, and many other websites, state that Batman: Arkham City will be released October 3rd, 2011 (10/03/11)
Also, inFAMOUS 2 is listed to be released on July 1st, however, a worker at GameStop revealed that since July 1st is a friday, inFAMOUS 2 will be realeased a few days before or after. So, possibly June 28th or July 5th, 2011.
Batman: Arkham City and inFAMOUS 2 are both sequels to acclaimed 2009 superhero video games coming out this year. If you won't to have your own copy ready don't forget to pre-order.