From the interview what i can make out is they are planning to use RVV-MD and RVV-SD as A2A missile for PAK-FA but from what i have read before PAK-FA will have a new class of A2A missile , Id 300 as WVR and BVR missile will be Ramjet R-77 and R-77M.
Do we have an idea yet of how two seat PAKFA will look like? Has there been official concepts out yet ?
edit: will it be side side like su34 or behind like normal jet ?
Look up the pictures of Berkut. It is more or less Berkut with stealthy nozzles and oddly shaped stabilizers.I don't think so this kind of plane can have jet engine inside of it...it's just too thin