I've been playing the beta now and since they added the starting scenario fro the broken shore for both sides, you can no longer skip it and just do artifact quests (fuck me) and I must tell you, this scenario (which I think is the pre-patch for legion that they're talking about) is SO GODDAMN BORING. It's just like the tanaan jungle bullshit (but a bit faster) except it's a scenario so you get nothing for doing it, no loot, exp or whatever. Just a mindless zerg and then some epic blizzard storytelling with uber cheesy scenes. (Everything sylvanas says makes me facepalm, damn they gutted that character from warcraft 3)
So yeah, don't plan on there being a lot of content for the prepatch if this is all there is, this is exactly like the scenario to blow up theramore. 100% AIDS