Wingman,
Adding 3.7V LiPO to 1:12 racing will not really affect 1:12 racing
The battery will fit in the same in cars. If racers are inclined to keep using NiMH, I do not see a problem. Either allow the the LiPO guys to motor up a level, or let let the NiMH guys use 3-cell packs so the voltages are near the same like in Sedan.
If 1:12 were to go to 3.7V / 3-cell I could equalized two packs at the same time on my Novak Smart Tray instead of just one 4-cell pack. I could save $10 a pack because one less cell. I can keep using my chargers and I can keep using my cars.