The NFL is making a pitch that under the terms of the current contract they can - and will? - have a limited free-agent period running from Feb 7 - Mar 4 (after the superbowl, until the expiration of the contract).
I'll admit I am no legal scholar, but I have read the CBA, and the language they're citing seems kind of vague and open to interpretation. I have to wonder whether players would go for this, if agents would go for this, or if legal action would ensue.
Hard to say, but I have to imagine a hastily crafted plan would have limited success.