It's from China Daily: "The acquisition, worth at least $2 billion, will include more than 10,000 mobile communications patents currently held by the United States company, according to a person familiar with the matter." [1]

Wikipedia said of the original Google purchase: "Motorola Mobility has 17,000 patents with 7,500 more patents pending."

[1] http://usa.chinadaily.com.cn/2014-01/30/content_17265533.htm

You're right, I was looking at a different article. Source for the 10,000 number is below.

http://usa.chinadaily.com.cn/2014-01/30/content_17265533.htm