Legion Artifact Claculator @ Wowhead
While you can sneak peak at the artifacts and jump happily about how cool you will be, ask yourself one simple question:
What will happen when the artifacts will have to be replaced by green weapons after Legion?
Clicking and adding the abilities in the calculator, I have noticed that the artifacts obviously touch multiple aspects of your gameplay, they are not about sheer numbers and spell power.
What I see is that Blizzard now happily constructs themselves a hell of a job to compensate everything they are now so happily forging into the “legendary weapons”TM.
IMHO the development team must start the “artifacts-have-to-be-replaced” brainstorm immediately after Legion is released.
Gnomecore 
I’d imagine it will probably just be an instance of the same situation they have with tier sets: the aspects that improve the gameplay (and fit the devs view of the class) will be baked in, the others will be happy memories.
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