The article suggests that 10,000 patents are part of the deal. I'm not sure if that's the same number as were originally purchased, but I have to think it's the lion's share of them.

I see 'certain patents'. I don't see a reason to read a number out of that.

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

I'm sure there's something in the deal for Google to at least retain rights to use the patents. Likewise Lenovo wouldn't buy Motorola without the patents.

Most likely cross license with Google staying as the owner of the patents.

very strange decision by google

They're probably worth more than that for Google if they are make-or-break for Android.