Yes they have... They've cut ties, bro. Might do you well to keep up on the news... And a buyout isn't a bad thing... The PPS would see a good jump and most businesses interested in a bid would probably have a better business structure than Znga's proven one. And before I get bashed, I'm long and strong ZNGA. They can only go up from this bottom.
I don't believe ZNGA will be bought out by the companies you listed. That is not the core of their business models. If ZNGA is proposed a buyout bid, it will be from someone already in the industry. I do agree something big is poised to happen though. But until these companies (ZNGA/GLUU) prove themselves regarding online gambling, a buyout target price would be relatively low. No company is going to buy at a huge premium on pure speculation. It's a little to early to put a buyout value on it right now until there's a couple quarters of earnings under their belt. I do believe the future looks bright though.JMHO
It's not just about online gambling. It's about the shift from social to mobile-social. In other words, many countries do not allow Facebook, but all countries allow mobile devices. If you listened to Glu Mobile's financial report presentation, they make a very strong argument for the need to have mobile as the primary focus. Online gambling is the cherry (or olive) on top :)