When talking about Ultimate's soundtrack, one must remember that this time remixes will be made as if they were a battle theme because Sakurai considered the current AC music to be unfitting for a competitive match.
My wishlist would be:
The Elemental Stars (Original)
Venus Lighthouse (New Remix)
Walking forward with Determination (New Remix)
Karst/Agatio Battle Theme (New Remix)
Saturos Battle Theme (Original and New Remix)
Fusion Dragon (New Remix)
Isaac's Battle Theme (New Remix)
Jenna's Battle Theme (New Remix)
Felix's Battle Theme (New Remix)
Matthew's Battle Theme (New Remix)
Boss Theme Medley (New Remix, Dark Dawn)
Battle Theme (Ship) (New Remix, Dark Dawn)
Felix Battle Theme/Doom Dragon (Old Remix)
With the song that was added in Smash 4 + these we would have 14 songs, add a couple more and it should be enough.
"The actual roster will be a lot better than the leak we got."
What is this implying?
The only way to top the Grinch Leak's roster is having them and even more. The worrying thing is the newcomer overload that this would come with.