I suppose this makes sense, in terms of the order. If a new weapon was to be added to the roster, instead of replacing an old one, it'd need new animations and models anyway, so having adding new versions of these to existing weapons being more of a priority than having the ability to add new weapons to the roster makes sense.
Plus, this weapons stats changing thing gives me ideas. I'd already PM'd them via. FB about a couple of weapon concepts, and being able to test one of them by altering stats for the existing weapons would be cool. In addition, it'd be good 3D modelling practice for me to make some alternate weapon skins (I've already made a concept drawing for a G36-esque equivalent for the AK assault rifle, a model for that shouldn't be that hard to make)
(In case anyone is wondering, the weapon concept shared via. FB was for a spear gun which gets an EMP warhead at max. upgrade level. For those times when you want to hunt the big game, like helicopters. Or tanks. Or just want to stab some poor mother-[SELF CENSORED] from across the road.)
EDIT: Here's the drawing concept for the G36. I originally made it as a new weapon concept to go alongside the AK in SR:TT, though it also would work as an alternate model.