#6. Jon mentioned during the meeting that they needed dragonglass. Sam discovers that dragon stone (where Dany lands) is built on heaps of it. Sam sent a raven to Jon, so I expect he will be going there.
Oh, I certainly understand the need/motive. I just don't understand how it's going to work, logistically. How does John Snow travel the thousands of miles from Winterfell to Dragonstone? (And winter has come; he's not sailing anywhere out of the north. Sam barely made it to Oldtown, and left months prior.)