Basically yes ,Microsoft,Time Warner,TenCent,Kohlberg Kravis Roberts,Providence Equity Partners(witch also fund ZeniMax btw lol) and Blackstone are all potential buyers.Note the other 3 i mentioned are not in the article,they are mentioned here,in the original source:
http://in.reuters.com/article/2012/07/09/us-vivendi-activision-sale-idINBRE8650SZ20120709
Though it would hilarious if Microsoft does buy them, then well COD will be an Xbox exclusive for life,same with WoW maybe.