Engadget: It's not often that we get word of a new gadget by way of an SEC filing, but Barnes & Noble has broken with tradition with an 8-K report that reveals its intentions to introduce a new e-reader. The form, filed earlier today, says that the company "indicated it expects to make an announcement on May 24, 2011 regarding the launch of a new eReader device," and goes on to say that the form was filed "solely to satisfy the requirements of Regulation FD.