I don't think this replaces zi8. Kodak still has the zi8 on its website and you compate this to it.
I haven't seen any indication if this camea does 60fps
OK, thanks for that. I was wondering if 60 fps was sacrificed to bring down the price. It seems the external mic was. That makes sense however on a waterproof camera. So it comes down to buy the zi8 if you need an external mic or need a camera before April or buy the PlaySport if you need a rugged or waterproof camera. Underwater slo-mo at 60 fps will probably make your vacation footage pop.
The only underwater vacation I will be taking is at the local pool. I spend a lot of time in the mountains however, thus the attraction to it being moisture proof.