So they're releasing two songs and MVs to my understanding. Boombayah and 휘파람 (Whistle).
Whistle's MV is directed by Beomjin (aka VM Project), who's done some great MVs, among them a personal favorite of mine, Red Velvet's
Dumb Dumb.
Boombayah's MV is directed by Seo Hyun Seung, who's worked on... most of YG MV's. I am The Best, Fantastic Baby, etc.
More teasin', ending with Jisoo.