Aoi Yuki had a small role in the Dad of Light special, voicing "Kirin" according to Wikipedia (I haven't seen the special, so I'm not sure who/what this is specifically). Tsuguo Mogami voiced/voices Artoirel de Fortemps, according to Heavensward's credits. Yuma Uchida has not had any credited involvement in FFXIV yet; not sure if he voiced Asahi, since he first showed up in 4.2 and wouldn't have been credited (I think...) in Stormblood's credits. We'll find out next Tuesday, at least, if not during the panel itself. Of course, as you mentioned, they may all have new roles in Shadowbringers due to dual-casting, especially since most of them (with the exception of Yoshino Nanjo and, to a lesser degree, Itaru Yamamoto) have had relatively minor roles previously.