The data used to support this split, also necessitates the split of Cabot's Tern from Sandwich Tern (accepted several years ago by IOC; still not yet by AOU). It would be odd, and very inconsistent, if AOU accepted this split, while still rejecting the Cabot's Tern split. Surely the two should be considered together?
It's still in their list of 'Proposed splits', not yet on the accepted list, but I'd guess IOC acceptance is a formality particularly if AOU-NACC accept it.
Is it, where, would usuall be in the diary?