I hope the 'fast-track title is NOT the Marvel Age one.

To me, 'fast-track' meant to catch-up titles that have fallen behind.
Subby & Shield are the furthest behind, but since they haven't had a release in the last year---it wouldn't be fast-tracking. The only titles that could fall under fast-track is Daredevil or Sgt Fury

To do another Avengers, FF or Spidey would just be pushing them further ahead.
If the fast-tracked title IS one of those, I really hope the June release is something that's been neglected or something new---Doom, Ka-Zar, Inhumans etc.