I was going to post this a few days ago, but I simply don’t have any information. I first read it on Tumblr, but The Firearm Blog also recently showed the same image (below). I’d hoped KelTec would make a 5.56mm version of their RFB rifle, and it seems to be happening.
The two new guns are the RDB and the M43. Calibers listed are .223, 6.5 Grendel, and 7.62x39mm. Initially the M43 made me think of the designation for 7.62x39mm, yet the bullpup at the bottom has a GI mag in it. I have guesses but none of them better than anything I’ve read online (Guns Holsters & Gear & The Truth About Guns).