I noticed there are a lot of special and perhaps even prototype weapons available for SOCOM forces (M4A1 Block II, for example.) and I think it would be nice if we could get XM8 weapons for them as well, because that's (I hope) a well known prototype weapon that I would love to see in a few varients.
Also, partially because I recently tried recreating Bad Company from Battlefield: Bad Company and they use XM8s (at least in the second game).

Also maybe the addition of M60E5 or E4 or something? They would be good for the Horizon Islands Defense Force.