I think it will be two different cameras: EF at $5K to $15K (FS100 or F3 competitor), and PL much more expensive, perhaps $50K (alexa competitor)
but yes: either that, or interchangeable mounts, having two different versions of the same camera makes no sense (ahem, it's like having a PAL and an NTSC version, ahem, absolutely stupid, ahem, sony, ahem...)