Nobody knows. We are all just playing the waiting game and seeing what Apple does for us. I think they want to collect my headphones to take a "closer look" which they did to others in this forum but they will find nothing wrong with them hardware-wise... It's all firmware... If they give me a new pair running an older firmware, they will of course work until they update to the new firmware... At which time I could tell them again, "Hey, the new ones were working on the old firmware fine and then auto-updated to the 2C54 and now we have the same problem that 2B588 caused to begin with)...
Yeah, there is speculation about that but this level of ANC is NOT sufficient imo. The way they worked before was superior. I've never seen Apple deliberately make their product worse... and make it worse than their competition. That's just not normal. If someone gets a headache from ANC... then... I feel like that's an issue to discuss with a doctor... not to change the firmware of every device ruining the device to begin with. Also, the product was so new that I'm not sure how Apple would have had enough time to receive enough reports about this. Doesn't sound right. They wouldn't just release an update that quickly to lower the ANC's levels to 20-30% of what they were before.
If that was the case... they should be well on their way to fixing this problem showing that it's the most popular thread here and AppleCare in multiple countries are aware of it... There was no such thread about headaches on the Community here. And even if there was, it is not popular like this problem is.
And a simple solution for the future is to add a slider to change the amount of ANC to iOS! They can also make an Android App if they wish to do the same thing like the Sony's. That's more down the line but seriously, there's no reason to totally destroy their own product this way.