Go to the Tamiya Championship Series thread in the Racing Forums. That's were just about everyone posts about the TCS races and Nats.
But to answer your question.......So far no news about next year's classes. But I can tell you they cancelled F1 for the Nats because only 3-4 folks signed up for it. There's your sign.
M03R, M04L, TT-01R Type E, Midnight Pumpkin,
Lunch Box, CC-01 Wrangler, SC10.2FT,
SC10B, Traxxas Slash