If people want to wade through in advance of the official announcement, here's a full set of differences
Thanks! Had a quick glance and must have missed a lot, but I see a fairly modest update, dominated by hypnen revision! A quick glance at the list reveals (apart from NACC-changes, nomenclature issues plus English name changes, including the hyphens):
Splits
*
Alignment with IOC
Arborophila campbelli
Arborophila rolli
Arborophila sumatrana
Collocalia splits
Eugenes spectabilis
Eunymphicus uvaeensis
Scytalopus alvarezlopezi
Turnagra split
Ptiloris intercedens
Pycnonotus conradi
Iole charlottae
Iole cacharensis
Zosterops ponapensis
Montecincla jerdoni
Montecincla meridionalis
Calliope tschebaiewi
Geospiza acutirostris
Geospiza septentrionalis
Geospiza propinqua
Melozone cabanisi
*
New stuff (all are or have been IOC potential splits)
Myzomela nigriventris
Lophorina niedda
Lophorina minor
Lumps
Cyanomitra obscura is the only one I could find!
Generic changes
*
Alignment with IOC
Anser-geese, Anas-ducks, Dendroperdix, Tetrastes, Ardea intermedia, Haliaeetus, Anous, Alopecoenas (finally!), Juliamyia, Carpodacus-assemblage, Carduelini, Myiomela, Sholicola, Montecincla.
*
New stuff (compared to IOC, not a single one outside NACC/SACC):
Pseudoscops clamator to Asio (but not Jamaican Owl)
Mazaria split from Synallaxis
Sphenocichla roberti to Stachyris (correcting past mistake)
Saltator atricollis to Saltatricula
Hemispingus/Poospiza-mess
Diuca speculifera to Idiopsar
Phrygilus concolor & plebejus
Haplospiza rustica to Spodiornis
Ixothraupis split from Tangara (but not Stilpnia, which must leave the remaining Tangara paraphyletic, no?)
Cyanocompsa brissonii & cyanoides to Cyanoloxia