About china ban, it is real, but the gornvenment bans btc as a fiat or payment ways, Chinese central bank announced that btc is not fiat money, it is a virtual money like game coins, or virtual goods.
They ban the deposit to Chinese exchanges' COMPANY BANK ACCOUNTS, but the bosses of exchanges are not stupid, they use personal accounts to handle deposits and withdrawals, the other way is that they have many agents to handle customers' deposit, customers deposit money to the agents, and agents transfer the money to exchanges accounts, so it is legal.
But last year deposit banning really hurt btc price, it went down from 600 to 200 usd, everyone was panic because deposit ways are more strict, and now they get less deposits before banning.
Chinese exchanges are thriving, if the reported numbers are reasonably correct.
CNY currently has a 'stunning' 2/3 of the volume and the two largest exchanges:
http://bitcoincharts.com/charts/volumepie/