As of today -- only the Poteet and Main Speed Demon is completely registered. There are a few other cars that are tentative about attending, and I'll wait to hear confirmation before I tell you. It's a privilege I afford them so they don't get hassled by youse guys. I don't have any information about the bike part of the meet. I've only heard from the FIA group - not the FIM.
Speaking of the car Shootout, I'd like to post some of the entry paperwork that's required. These are the basic rules -- but I've only got it in PDF form and it won't copy and paste. If you'd like to see the stuff -- email or PM me and I'll send all 4 Mb to you.