one of main reasons for #3464 MiG-31BM modification was integration of #915 - AA-13 Arrow [R-37M], also known as RVV-BD.
Its missing from available loadouts (up to 4, replacing r-33S)
http://www.janes.com/article/43640/mig- ... ve-air-ops
It also get possibility for medium range RVV-AE (also up to 4, possible mixed loadout 2xRVV-AE, 2xRVV-BD againd cruise missiles?):
http://www.testpilot.ru/russia/mikoyan/ ... ig31bm.htm
and finally, integration of lots of A2G ordnance, none of which was shown in field except of Kh-31P, which makes some sense (currently probably Kh-31PD/PM).