So this will be BTC only? Why not separate yourself from the pack and accept some alts or some Counterparty assets?
I think that if you are aiming at some serious long-term site, going for altcoins would be a great choice. Now, most of the gambling is done I BTC anyway, so one would have to have a good reason to justify the extra development effort.
For the moment we are focused on establishing a robust payment system with Bitcoin-only. We can't accept altcoins because we don't take conventional deposits where the operator merely processes an arbitrary amount that players can use to buy into games. Each game requires its own automated payment processing instance. The safest and most recognisable way to do this is with Bitcoin.