That's exactly right, they had a few promising updates from DCA. That a batch would be due in Summer or that they were expecting a prototype soon. Seems to have gone fairly quiet. The externals would be the major selling point. Rather annoyingly in their MK48 series, their gearbox has differences to a standard 249 box. There's a decent thread on Arnies airsoft about it in the review section.
As regards LMGs, some sites have ammo limitations in milsims, which benefit the wielder. Good for morale on the team and a bit of variety. Still think it's not the best LMG (Again that battery arrangement is head scratching), at least something different. If it leads to some players choosing it over a drum mag equipped PCC, it's a good thing. Will be interested to see what direction their AK goes in the new year.