The series features the Sagittarius
and the Endeavour
from Star Trek: Vanguard
Clark Terrell, Atish Khatami and their crews will be the main cast.
PS: Sorry if your response is "well, yes, I know
that"; I don't think there's much else revealed. Although David Mack
did mention that an Orion crewman will feature - she's apparently going to be more important in book three than in the opening two-parter, I think?