Mew Gull is with NACCWow, the most potential splits for ages, they have finally got round to looking at the New Guinea proposals as in the two recent field guides and HBW/BirdLife, and very pleased to see the Solomons boobooks being re-evaluated. Still waiting on Common (Mew) Gull though......
https://https://americanornithology.org/nacc/current-prior-proposals/2021-proposals/
.org/nacc/current-prior-proposals/2021-proposals/
Assuming if this (plus several others) pass then IOC will act upon them (?)