I do know that there is likely to be some clarity in the use of fiberglass such as hoods. (which is not a component that makes a car any quicker)
I can't comment on any rule changes that may or may not be in the works as it's not something I'm privy to, but in response to this statement I feel the need to point some things out from last years rules.
Quoted from 2010 Rules
Chassis & Exterior
1. Lights, horn and windshield wipers must be operational.
2. Aftermarket fiberglass or carbon fiber bumpers and bumper filler panels are allowed.
3. MINIMUM vehicle weight including the driver MUST be at least 3500-pounds for a vehicle equipped with IRON heads and 3650-pounds for a vehicle equipped with ALUMINUM heads.
4. Complete stock and painted T-Type, Turbo Regal, Grand National or 1989 Pontiac Turbo Trans Am body required.
5. Stock wheelbase is required.
6. The engine and the firewall must be in the stock location.
7. Stock operable door glass windows, glass quarter windows (where applicable), glass front and rear windshields are required. No lexan.
8. Factory stock suspension locations required with any type stock location shock absorbers.
9. Any suspension stabilizer/ reinforcement bars or traction enhancing devices are allowed.
10. Sway bars may be removed.
11. No ladder bars or coil-over equipped rear suspensions.
12. Outer frame rail notching is allowed. Inner frame rails must remain in the stock location.
13. Reinforcement at the inner rear frame rail is allowed.
14. No quarter panel modifications except rolled inner lips.
15. Minor modifications to the stock rear wheel wells allowed but no mini tubs.
16. Factory stock appearing front inner wheel wells required. Trimming for downpipe clearance is allowed.
17. No wheelie bars.
18. The brake system must be a Power Master or vacuum boost operated, or manual brakes are allowed.
19. A brake system line-lock is allowed.
20. The driver’s name on the side window is allowed. Sponsor or vendor decal(s) are acceptable on the rear window and rear quarter glass windows (where applicable).
21. A maximum of two (2) hood mounted gauges are allowed.
22. The Turbo Trans Am must use the factory production stock K-member.
End Quote
I'm sorry, but a fiberglass hood is not a stock body part on a Regal or TTA...Only body panels that can be fiberglass are the bumpers and bumper fillers. Rule says stock, not externally stock appearing.