I just found this NRA press release. They WILL boycott.
http://www.nraila.org/news-issues/news-from-nra-ila/2013/nra-withdraws-from-eastern-sports-outdoor-show-due-to-reed-exhibitions-decision-to-ban-modersn-sporting-rifles.aspx#.UP9Hvj4ANhh.facebook
Thanks. It will be interesting to see the final count on just how many vendors go along with the boycott.