Lots of sources on this, this is one:
Now that it is here, curious of BFTB's thoughts. To get things rolling, I see the players' side, not the owners.
1. Give us back $1b a year because our finances are being squeezed, due mainly to the stadiums we chose to build.
2. Play two more games for the same money.
3. No, we won't show you useful data to prove we are being squeezed.
Given the value of the franchises has been soaring and the NFL revenue is growing to $9b, it seems like a very far reach to claim financial duress, especially while being unwilling to prove it.