To generalise massively, Chinese aren't trying to move money out of China.
Instead, they are trying to find any safe store of value, because they don't trust their banks.
Chinese are desperate for any way to save money, because the four-grandparent policy (and no pension) means they need money in old age.
The optimal solution for them is overseas real estate (see the real estate market in Hong Kong, Sydney & Vancouver).
The non-optimal solution used to be domestic real-estate. This solution was less than ideal, because of the huge oversupply in the Chinese domestic market. Chinese investors are aware of that, but "happy" to lose some money, rather than all of it in the case of a bank (and additionally, inflation in China is ~8%, but banks only pay ~1% interest).
It looks like Bitcoin is taking the place of some of that domestic real estate demand.
Note this is only my personal theory, but based on observations from http://brontecapital.blogspot.com.au/2012/06/macroeconomics-...