Talked about the 3-4 and how 50% of snaps last season were from the 3-4 alignment. Covered a few other things about the defense and so fourth.
Not to nitpick, but I must have missed this portion of the interview. Though I did hear Beason say they lined up over 50% of the time in an "Under" formation, which is 4-3 in principle(basically a five man front out of the base 4-3 package in which the Sam backer lines up LOS).
I interpreted his very rudimentary explanation of the base defense as having the personal to be very multiple while playing within the formations in which our players are best suited. He spent a significant amount of times explaining how our team is just built differently than a team that can base in a 3-4 alignment(not to be confused with the common 5 man front we played in for a majority of the pervious season from our base 4-3 package).