Yes, It's coming.
http://arniesairsoft.co.uk/forums/in...-ghk-aug-gbbr/
Multiple sources confirming it too, so we will hopefully see a new release form GHK soon, and not a collaboration like the "Project-T (TAR-21)" with Hephaestus.
It'll be based off the Project-T, which speaks GHK G5 internals to me, and it won't be a "limited edition."
Hopefully it'll be an A3, time will tell, these are all speculations, even though I don't want to believe the sources, I just hope it comes Q1. ^_^