According to RC World (Japan), they claim is water proof. In Japan, it is sold for around US$230.
jfc_tech,
You can order from Control Centre in Hong Kong.
I don't plan on getting the quantum 2 yet because I just got the SX12 and sold my SX 9.
The only real problem is that you have to use different Capacitor. The best is use Novak's or the big one from Yokomo for 3300mah.