From the NFL release:
During the Final League Year, the eight clubs that make the Divisional Playoffs in the previous season have additional restrictions that limit their ability to sign unrestricted free agents from other clubs. In general, the four clubs participating in the championship games are limited in the number of free agents that they may sign; the limit is determined by the number of their own free agents signing with other clubs. They cannot sign any UFAs unless one of theirs is signed by another team.This is really limiting for those eight teams. Not only can they not sign free agents until they lose them, they also can't sign them for bigger contracts than those they lost. The teams that lost last weekend will be permitted a sign one UFA, if I am reading this correctly.
For the four clubs that lost in the Divisional Playoffs, in addition to having the ability to sign free agents based on the number of their own free agents signing with other clubs, they may also sign players based on specific financial parameters. Those four only will be permitted to sign one unrestricted free agent for $5.5 million (estimated) or more in year one of the contract, plus the number of their UFAs who sign with another team. They also can sign any unrestricted free agents for less than $3.7 (estimated) million in year one of the contract with limitations on the per year increases.
In the case of all final eight teams, the first year salary of UFAs they sign to replace those lost cannot exceed the first year salary of the player lost with limitations on the per year increases.
This also provides opportunities for rivals of those teams to depress the markets, or at least to delay them until free agents that they may be contending for have gone elsewhere. It will be interesting to see how this develops but I expect significant unintended consequences from this.