With BlackBerry World 2011 coming to a close, you knew there had to be some unannounced news waiting to come out of the conference, right? We have been told by multiple sources that RIM is planning on releasing its followup to the BlackBerry PlayBook around the holidays this year. That’s clearly less than a year from the April launch of the original PlayBook — and the 4G versions aren’t even out yet — but there is a key differentiating factor here… the screen size. It’s entire poss...