My money is on the following (and not in any particular order)
B&M - Wing or Surf
Mack - Striker (a bigger version of Voltron would be amazing)
Premier - Alpenfury on steroids (hopefully with multiple blocks)
Vekoma - multiple inversions/maybe multi launch
AND my sleeper pick
Intamin - Worlds tallest vertical launch coaster
To justify Intamin, supposedly they were in the bidding process for TT2 AND the legacy Six Flags company was working with them on multiple rides coming this year. I really do feel like it's one of these on the list. A Mack spinner would be great, but I'd only accept a Ride to Happiness type ride.
B&M - Wing or Surf
Mack - Striker (a bigger version of Voltron would be amazing)
Premier - Alpenfury on steroids (hopefully with multiple blocks)
Vekoma - multiple inversions/maybe multi launch
AND my sleeper pick
Intamin - Worlds tallest vertical launch coaster
To justify Intamin, supposedly they were in the bidding process for TT2 AND the legacy Six Flags company was working with them on multiple rides coming this year. I really do feel like it's one of these on the list. A Mack spinner would be great, but I'd only accept a Ride to Happiness type ride.