Send me a G906K to test firsthand and I'll definitively answer that.
For the moment, I don't have one to test. But it is implausible that a recent high end model wouldn't work with ART. But that is referring to the system (OS) apps. Third party apps are another story entirely. There is no guarantee that existing third party apps have been updated to work with ART. If you are an early ART adopter.. there will in fact be many third party apps that will not run on your handset.
Presuming that Dalvik remains an option, I would in the near term continue using Dalvik until apps in general are updated to use ART.