What is going on? BTC price up
Who? Chinese people buy

Why? I don't know exactly why (capital restricitions? ...)
Chinese population is more than 1.4 billion, just can't wait Bitcoin fervour goes viral out there

There was many times that there was more then 95% all transactions on chinese exchanges. So volume is not really some legit thing to see what is going on. If there is no fees you can buy your own BTC all day long.
I am not saying chinese people are driving price up. It was expected.