There will be no reunion between Luke and Leia.
Luke doesn't seem to have a lightsaber for the movie (or at least most of it).
Rey will be trained by Luke similar to Yoda, but with a unique spin due to Luke's emotional state.
This movie does not sound like ESB 2.0
Luke's journey will be much more "mystical"
Luke has a compass of some type.
The birds that they once thought were Convorees are not actually Convorees, but only look like Convorees.
The birds are actually called "Porgs"
The birds are very soft white and grey and have a small amount of orange by their eyes, which are two completely black circles. They are both adorable and creepy and heavily inspired by Puffins.
The birds in the background of the final scene of TFA are not Porgs. Porgs do not have long tails.
There was a scene they were filming in Ireland (some video of them filming this scene is publicly available) in which their is a Porg nest. The baby Porgs are "fucking disgusting." They are featherless and gross.
There is a scene with Chewbacca alone on AHCH-TO and he "goes back to nature" and interacts with the Porgs in some way.
The Porgs are a significant feature of the film, not just a background creature.
Luke Skywalker does have a scene where he explains to Rey her connection to the force and why it is important. Jason does not know what exactly Luke says.
Laura Dern's Admiral Holdo has purple hair, prequel-like clothes, and a silver blaster.
Rian Johnson took the best visual aspects of all eras of Star Wars as influence for this movie.
The costumes are much better than in TFA.
Jason couldn't find any evidence of Leia getting injured or hospitalized in any way.
Leia has a black, angular, dress that looks mourning-esque.
There is no evidence that there is a funeral on Dubrovnik.
Leia's main outfit is a brown Resistance dress.
Leia has her classic pistol from the beginning of ANH.