I doubt Intel will be lowering their prices, or refunding anyone a portion of the price of their previously purchased CPUs, that's for sure.
Look what happened after the VW diesel scandal ('dieselgate'): VW had to pay for repairs, and pay buyers (my friend bought one of the cars and got about $6k IIRC). Some people even went to jail.
Intel (or any other CPU maker) will probably not suffer similar fates. This situation is a bit different, because they may not have known about the problem. Still, everyone who bought a CPU is going to get a 10-30% performance haircut because they made a mistake. And Intel isn't going to have to pay for it.