Zynga buys iPhone game engine development team (Cocos2D/Zapus Media)
reuters.com
reuters.com
Also, since Zynga is already using Cocos2D, it is possible that any improvements or further work on the framework will not be released to the public. Purely speculation, but I can't see how Zynga would have any profit or benefit to having Cocos2D or improved versions of it in the open. Especially if it means that other developers/companies can develop with it.
1) You haven't done your research, nor do you sound like an insider. Cocos2D is licensed liberally and a forked version could be used in closed-source commercial projects without any trouble. It took me under a minute to find the license. I think it's the MIT license. https://github.com/cocos2d/cocos2d-iphone/blob/master/LICENS...
2) It's based on fallacies. Just because it's possible doesn't mean it's likely. Companies often benefit from outside contributions to their open source projects. Releasing an open source project doesn't always mean it's significantly easier to replicate a company's business model.
3) It's useless. It's not a serious attempt at getting a fork going. It's also commenting on a career decision that's already been made.
Congrats to Ricardo, Zynga, and Cocos2D!