allpaintballsupplies.com will be there.
Paintball Kingdom will likely be there.
PBC will likely have their tent there again.
DerDer i'd imagine would be there as well as a few others i've probably forgotten.
Spyder will make their first CFOA appearance.
Ground Zero / Eclipse, Boost Hoppers, Gotcha Covered Photography, & AllPaintballSupplies will be there. Not sure on PBC's plans, but would guess that they'd have some presence there.
PB Kingdom will not be at RiverJam.