I suspect that if anyone here had to bet some serious money on "hit" or "miss" on anything that's being added in a patch, most would bet on "miss"
Anyways, chances are northlands will be empty of real content for now and just used for missions and "exploration" (as if you couldn't explore it in a couple hours... after all, it's the same old zone with "new" monsters). I have this bad feeling that campaign may not be implemented in northlands yet, based on the teaser that announced them. It would ofcourse fit in SE's obvious plans to stretch all content to their limit. WotG taking years by interlacing quests and missions in updates, updates having five minute fixes announced as big changes, etc.
My hopes are literaly on the floor, but I'm still waiting for the notes to come out like a little kid.