I still wonder whether Minsc and Jaheira will actually be full companions like our EA team, or recruitable only in the sense that they can join us for some particular missions they have their own interest in. Personally I’d love it if we could have our core party of four but occasionally supplement it with guest companions who have their own scores to settle for specific quests (like Halsin and/or Barcus for Moonrise Towers), who would join as additional party members somewhat like Halsin already can in the Shattered Sanctum or like Lae’zel even if there’s already a custom party of four in the prologue. If something like that were the case then showing more Minsc and Jaheira might indeed be a spoiler, but it’s even more rank speculation and I’m not really expecting Larian to go that route.
I'd like that approach too, admittedly.
Solasta did something similar, with a core party of four but the two remaining slots constantly filled by temporary NPC guests.
I think it worked rather well, all things considered.
