I think roar knows li//bl is coming, but they just want to let the big boys in the r/c business have time to make the switch from nimh//brushed to li//bl. Now that lipos have the backing of big boys such as orion & trinity it probly will not be long before lipos are race legal. I am sure that you will still see sub-c size batteries at major tc events & such just because it is possible to get more power from them. However, a new breed of class that features much longer electric mains will probly come in the near future as well.