"Your friend, the Usurper, would lie beneath the ground if we had been" is what they changed it to. A more modern version, woe would sound weird when said aloud. I don't dislike the change. A shame that they cut the rest of that exchange, but completely understandable, and show watchers wouldn't understand most of it (Who would remember Ser Willem, or Aerys (mad king), Lord Redwyne and the siege, etc)
They also mentioned Hightower in the council scene, as Lord Commander who stood in the Council meetings.
About the lack of Whent, I guess a 7-3 or a 6-2 doesn't make that much difference on the screen, just some extra dead extras, and 6v2 is easier to choreograph. Shame because I find House Whent quite cool, with Harrenhal, its curse and tournament, the (retarded) winged bat helmet.
And about the North, we yet have to see the Mormonts or the Manderlys reappear, and it could be the final climb before the fall for Reek Snow. And Davos was seen travelling in the trailer.