While both Eagle
are theoretically taking part in Taskforce Vanguard, don't expect a Star Eagle Vanguard story anytime soon. The events of Vanguard take place some years after the current Star Eagle novel timeline and I'm unlikely to jump that far forward.
While there are no immediate plans, I wouldn't rule out a Star Eagle/Vanguard themed novella or short story. Eagle characters may also pop-up in stories by other UT authors.