I think a lot of the countries are now standing on the fence for btc. They will see how other countries deal with it before they made their own decision. However, for gambling, this is mainly disapproved or discouraged in most country. Even if you have to open a official casino, there are tons of strict rules that you have to follow.
yeah, and I think investors will also try to look for some other investors who had started an online gambling that uses bitcoins as a currency in their network if it becomes profitable.
And definitely all countries have strict laws and rules when it comes to gambling, even those countries allowed gambling in it, so better before building any gambling website or gambling place in your country especially china, as what the thread starter said, he should need to consult an attorney or a lawyer in regards to his question here.