Official Notice: Final Cut Studio applications will NOT launch in macOS High Sierra.

Not that it's a surprise, but yesterday Apple sent out official notification:

Dear ..,

Our records show that you may be using applications included in Final Cut Studio. We wanted to share some important compatibility information about these applications and macOS High Sierra, which will be available this fall.

Older versions of Apple pro video applications — including applications in Final Cut Studio — will not launch on a computer running macOS High Sierra.

New versions of Apple pro video applications — including Final Cut Pro X, Motion 5, and Compressor 4 — are compatible with macOS High Sierra. You can purchase these applications on the Mac App Store.

You can learn about transitioning from older versions of Final Cut Pro to Final Cut Pro X here.

For more information about compatibility of Apple pro applications on macOS High Sierra, please view this support article.