I don't see how it would be 8 games. It seems like players would either have their suspensions overturned or they won't. What, are they just going to cut them all in half?
Yes, the mechanics of that seem a bit complicated.
I don't think they're going to have a special Josh Gordon Provision that specifies Gordon's punishment. I suspect they're going to fit Gordon's situation into a broader provision of the new agreement.
I suppose it's possible that the new policy would include an 8-game suspension for players in stage three who test higher than 15 mg/dl (or whatever the units are), but that seems very unlikely.
It's also possible that the new policy would include an 8-game suspension for players in stage three who test higher than 50 mg/dl, but that the amnesty provision would affect only the punishment, not the question of whether there was a violation. That also seems a bit unlikely...
Maybe it will say something like any player who violated the policy in 2014 will have his case reevaluated under the new policy (both on the question of violation and punishment), but any player who violated the policy in 2013 but who is serving his suspension in 2014 will have his suspension reduced by half if his 2013 violation would not have been a violation in 2014.
I guess there are a bunch of possibilities, but they all seem a bit convoluted.