Still think they are going to chop Bran's arm off and leave it somewhere as a trap, since it is the bit with the NK mark. Jamie gave it a knowing look when he showed it in the meeting.
Although I do also subscribe to the NK making a beeline to Kings Landing theory, rather than being at the battle at Winterfell. My guess is it will take 2 episodes to resolve that battle, with midpoint being Winterfell being brought to the brink of defeat, and the last half hour of the second episode being some last stand in the godswood where the White Walkers are dispatched somehow, and all the wights in reasonable proximity drop. Then someone will pipe up "But, where is the Night King? I would have thought he would have turned up". Cut to Kings Landing where NK begins laying waste to the Golden Company etc, on his dragon. Then back to Winterfell where everyone who is still alive and can fit on a couple of dragons will dash down for a final one on one in the last episode.