Faro does often run with large CE cabins, I suspect it's a nice little earner for BA. Regular readers will be aware that CE numbers have been capped due to crew shortages so it's good to see that may be coming to an end. So I'm not sure if they will enable ET exit rows again, but clearly they may put in an A321 which would give the exit rows at the back. If you paid for an exit seat and end up not getting one then you can fill in the claim form online and get a refund. It may be that you would be offered a good priced POUG if CE ends up with empty seats.
https://www.britishairways.com/trave...ing_claim_form