TL;DR: It appears that dispersal into smaller islands such as New Britain, Tanimbar and the South Pacific has only been undertaken by species with a "flycatcher" body form, and that Eopsaltriaaustralis, Tregellasialeucops, Melanodryascucullata, Heteromyiasalbispecularis, Drymodessupercilious and Microecaflavigaster may each comprise more than one species.
TL;DR: A fully resolved and very well-supported phylogeny is produced that addresses many of the previous systematic debates in this group of passerine families and a new subfamily arrangement is proposed.