I don't think there would be any legal barriers preventing Feige and people working for him from having detailed, lengthy conversations, meetings, memos, e-mails etc. regarding what they will do once they have the Fox properties.
My wife's company bought another company, and during the time they were waiting for the official closing, they did a lot of things to make sure they could hit the ground running on the day of closing (including things like discussing logos, business cards, office space, what groups would likely be merged etc. etc. etc.).
The primary legal restriction was they couldn't actually coordinate with people at the other company. They couldn't call them up and discuss projects they were working on and specific details of what would be happening after the closing, but internally, they had plenty of freedom to plan and discuss. It wasn't a forbidden topic. On the contrary, they needed to put a lot of things in place to make sure it would go smoothly. The only forbidden element was cross-communication and coordination with the other company.