it will not compete with bitcoin as many think because it will be centralized, so there are more chances that it will actually help bitcoin to grow
well, bitcoin and other crypto currencies make people in china interested in it, which might trigger some people to get their cash out of the country in a fast and easy way. by creating their own digital currency they might try to get people to use that instead of bitcoin and other crypto currency. it's just speculating, but a fair possibility. bitcoin will always be different as the chinese digital currency will be ruled with iron fist.