My assumption is:

Shantotto = Casting/Healing
Lilisette = Aiming/Scouting
Prishe = Striking
??? = Fending/Maiming

Last one might be Zeid, maybe?

I hope for the last tier they go purely player armor sets. There are so many I'd love to see in HD, like the Igqira Weskit set with the arm tattoos, the San d'Oria guard armor, tons of things from Aht Urhgan, AF gear, etc.