I'm in Hong Kong.
1) The PBC has basically given the green light for bitcoin trading and exchanges. They are trying to keep bitcoin trading "separate" from the other parts of the financial system so that if bitcoin blows up, then nothing bad will happen. The thing that I think they are worried about is a Lehman style situation in which something blowing up in derivatives brings down the rest of the economy.
The strategy of creating a ring fence around new markets is a very standard one in China. Hong Kong is an entire city that is ring fenced.
2) Not terribly much. It only started to get on the radar screen a month ago.
3) The main driver is that there are tons of money in China and no one knows what to do with it all. The traditional investments (real estate and stocks) have been closed off by government action since the government has made it clear they will kill any bubble in the real estate and stock markets. So the money is going into all sorts of "non-traditional" investments. Bitcoin is just one of them.
4) Geeks. So far it's not the type of thing that random people will buy.
5) It's not very mainstream. However, its taken the Chinese geek community by storm and there are a lot of geeks in China. As with a lot of Chinese things, the fraction of people in China who are geeks is small, but a small fraction times a billion is a lot of people.
6) No harder than it is to buy anything else online.
Bitcoin has not gotten much mainstream attention and its still something that is with geeks, but you have the perfect storm of a lot of other things. The main thing is that bitcoin has hit China exactly at the time where China is looking at restructuring its entire economy and financial system to move out of low tech industries into high tech ones. It also hit China at just the right time in the credit cycle. China has recovered from the 2008 crash and is just starting to enter into another boom phase (which will last about two to three years before the economy crashes again).
