1. Obviously - Luke entering the Falcon Cockpit - Awesome. They could have cut it right there, and I would have been happy.
2. The Falcon kicking arse all over the place. Similar footage of the ship evading TIE's in the crystal cavern, but then bursting through the Crait surface and then blasting TIE's in support of the Ski Speeder force.
3. Some more stuff indicating Rey is tinkering with darkness - as always, some possible misdirection.
4. See #1.