The exhibit hall is all companies marketing their products and services: 3D printers and 3D displays, gfx cards, physics engines, lessons-on-DVD, animation toolkits, etc. LucasArts demo'd their physics engine for XBOX 360. Get the Plus for the cool stuffages: new research demos, walking/shaking/dancing art etc. I only peeked in the door to those so take it from others, or just pay the $25 and go.
Re: More Exhibits Only and Exhibits Plus