I hate to say this, but as more comes out, and it appears that the House of Mouse made the initial approach, I'm betting it was only for those IP's most valuable to the Diz. Let's face it, they don't need a convoluted studio system, theirs is already almost too much to rule over.
I'm betting now that the deal was for SW Ep4, the Marvel characters, maybe even only the FF package for now) and Avatar. Two billion dollar bundles for sure (SW/Avatar) and the ticking time bombs that are the jumbled mess of the Mutant worlds and the heavily damaged by Fox FF rights. Deadpool is sort of some separate world, and yet, the Mutant tie shows it is the one thing they think they deserve, another Billion dollar franchise.
Yet, this year, we have yet to see such a franchise from Marvel Studios. GotGv2 failed to make a billion despite the hype, Spidey faltered short, and we still need to see the impact of JL on Thor to know if the God of Thunder will leave the world 'thunderstruck' at the WWBO. Deadpool might do it, even without China. But who knows? Only Uatu and Eternity.
Now, with others wanting those four bundles, just to spite the rodent they fear, I think the Mouse has to decide, is the Murdoch counter-offer, of them getting a stake, probably a big one, in the Mouse worth it? Or do they need to throw down one hell of a counter-offer in pure cash, saying "nope, just the IP we want, at this price" and pray the auctioning of Fox, which is going to be very heavy in the regulatory triggers, finally makes them realize they'll need the cash on their (Fox's) side, just to get through what they can.