Chris Metzen discussed the fact that this really doesn't mesh well and the internal Blizzard lore folks aren't really happy with it. They plan to eventually go back and make Outland and Northrend fit with the revised storyline. The problem they ran into is purely a lack of time. As an example, Wrath of the Lich King had around 1000 quests in Northrend. Cataclysm has 3500 quests without touching either Outland or Northrend.
So, these changes to make the lore line up are planned, but there is absolutely no schedule as to when they will be implemented.
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