This episode- Wow!! Like many said, definitely one of the best in the series (if not the outright first). After watching it, I really want to believe that Jon is important. The ending with the Night's King just made it seem that way. How can we possibly lose him for good after he gets Caesar'd? However, there are strong indicators for both outcomes- him dying permanently (wall becomes a wreck, Sam maybe becomes more important, etc.), or him being resurrected (what everyone has been discussing). I don't feel like what Sam said was necessarily foreshadowing, as I feel like in the past characters have said stuff like this before (especially relating to Robb) only to have the characters die for good. But I thought it was funny that he said "I have been waiting for years". Haha! It has been years since the last book came out. As for Jorah- I think he wants to see Dany as he dies.
