I actually heard an S&S rumor a while back from a somewhat reputable source, this actually might be my new guess! An air launch would be much different from Sky Rocket, and in that compact space it's the perfect way to get a train up to speed to clear a 197 foot hill with a short launch track. I could totally see one of these shooting around that run down plaza.
If it's this size, the challenge will be making sure it's different enough from Phantom but if it's launched, the challenge will be making sure it isn't seen as just a bigger Sky Rocket. Maybe a launch into a huge inversion before continuing on?