Will Blackmagic Ursa 4K file edit in final cut Pro X

BMG's specific implementation of RAW requires you take it into Resolve first, then batch export as ProResHQ. Since FCPX's import is a plugin architecture, each camera manufacturer can write their own codec handling for it. BMD doesn't seem interested in doing that for any NLE much. Good way to make you use their software, thus, more of their hardware.

You might want to check out this recent webinar from Moviola

http://moviola.com/webinars/getting-the-most-from-the-blackmagic-ursa/