Some of the items that interested me, in no particular order:
Bushnell Elite 1-6.5 FFP, BRT reticle, illuminated, typical Bushnell Elite glass (which means it's good!) Looks like retail is under $1,400. I'm not crazy about optics, but this one has me very interested.
Lancer is making carbon fiber shotgun tube extensions- they look great. Lancer is also making a very nice looking line of complete AR rifles, including a 3G specific rifle.
Remington 22" Versa-Max w/ factory Nordic extension- retail about $1,400.
RCI (makers of X-rail) is making shotgun tube extensions that are one piece. Unscrew existing 3 round tube from Benelli, screw in one-piece 8 round tube.
Samson has a new barricade stop for the Evo handguard.
DPMS 308 3G rifle- just like it's little brother.
JP is making a captive AR buffer/spring replacement. The cut-away demo they had cycled very smooth. This is one of those things that you see and think "why didn't someone think of this sooner?" JP also will be making 308 uppers that are compatible w/ DPMS 308 lowers.
I didn't make any notes while walking around, didn't take any pictures, so this is not an all-inclusive list of cool items for 3G- only what I can remember at this time.