First impressions:
Completely surprised by the small amount of changes. It seems like we are mostly going to be business as usual. Much will depend on how the removal of dot snapshotting will affect our gameplay (mostly an Affliction and Demo issue).
The Good: More widespread availability of Spell haste buff and the leveling up perks (even though I fully realise we are only getting power ups we would have gotten anyway, and are balanced around)
The Bad: Removal of Fel Flame and Drain Soul, nerf to Healthstones and gateway.
The Ugly: Professions no longer giving combat advantages
Hope the datamining maybe unearths some more good stuff, even if it's not directly Warlock related.