I absolutely think it’s a sign of Final Cut X coming for the iPad Pro. The same thing happened with LunaDisplay, when Astropad announced they were working on a Windows version… 2 months later, Apple announced Sidecar, which completely destroyed LunaDisplay on Mac. Obviously, the developer knew what was coming, and had to diversify before being wiped out.
Also, there is no question IMO that pro apps are coming to the iPad Pro, because Apple needs a reason for people to shell out for the Pro. As it is now, the regular iPad can do just about everything the Pro can, including drawing, which was previously a huge exclusive to the Pro.
My bet is Apple releases FCPX for ONLY the Pro model, and probably only compatible with the last gen of the Pro… as well as, of course, the shiny new Pro they roll out simultaneously.