If its a pair of two man weapons teams I'd imagine we'll see a machine gun and a anti-tank weapon.
For the Russians I'd rather see an Kord than an NSV if they're going for cutting edge gear. With Empress already doing a Metis-M, but the crew are a bit dated for modern games (fine as irregular forces of course), an ATGM could be useful as well.
Rather the better option may be to make weapons which aren't already out there, and then pair their modern crews with the older weapons which other companies are offering (i.e. Empress/Eureka/Spectre/Tiny Terrain Models) - instead of duplicating what's already there for the sake of new tools.
Yes though, mortars aren't as common a weapon to see in this scale for moderns. Nor are longer ranged weapons in general. I've had to buy a WWII artillery piece because larger guns just don't exist in this scale for the Nations I'm representing. :/
Again I can't speak for the Americans. Though they tend to be a bit better from what I've seen as far as shoulder fired launchers go. But US players will have to look at Empress/ Eureka/ Spectre - and whatever other companies covering Americans right now have already done and try and come up with something which isn't currently available for the most bang for your buck (I'd rather have a gun that I can't currently buy, instead of just a better detailed model - we've put up what we already have for years. They'd be nice to have, though not being able to field something else at all is probably more of an issue).