Good question, OP.

Here's the Google Trends data for Chinese, Japanese and Korean versions of the word "Bitcoin":

http://www.google.com/trends/explore#q=%E6%AF%94%E7%89%B9%E5%B8%81%2C%20%E3%83%93%E3%83%83%E3%83%88%E3%82%B3%E3%82%A4%E3%83%B3%2C%20%EB%B9%84%ED%8A%B8%EC%BD%94%EC%9D%B8&date=today%203-m&cmpt=q

As you can see, China has learned that Bitcoin exists in the past two months, but searches in Korean are still at approximately zero, and Japanese has so few searches it can't even be graphed.

EDIT: Hmm, it seems that "Bitcoin" is more popular in Japan than "ビットコイン". (Japanese Wikipedia uses "Bitcoin", for example.) That makes it a bit more difficult to graph just Japanese searches.