Lots of talk about QR not gaining from this JV but they don’t offer Premium Economy so there are opportunities for BA to tap in to a new market. also far fewer Avios earned on QR than BA.
Personally hope this gets approved as I think QR are fantastic, even in Y. Every time I have flown exLHR on QR in Y the planes have only been 1/3 full so almost guaranteed spare seats to stretch out.