343i's Andy "Bravo" Dudynsky & Quinn Delhoyo talked on twitch about the current status of their weapon tunings that will be released on June 3, 2013. This video gives an overview of what they talked about along with some gameplay.
Not really sure I like them messing with the AR. I like it the way it is. Giving it a buff would just cause too many problems. Upping the number of shots in the BR from three to four sounds good. I don't like the idea of them buffing the machine gun on either the Warthog or the Mantis. Their powerful enough as they are right now.