Officially announced on StarWars.com. This title can harvest all types of theories and thoughts in general. In my opinion this title refers to Luke Skywalker, Snoke refers to "The Last Jedi" in The Force Awakens, Episode 8 takes off right when Rey meets Luke, Leia never went forward with Jedi training and the Force is strong with Rey, but she is not a Jedi yet.
As for the red lettering, it is a great call back to past Star Wars titles like Revenge of the Sith and Revenge of the Jedi. I have no thoughts about what the red lettering can mean but I myself like it a lot and cannot wait to hear more future announcements!
Head over to StarWars.com for the offical release!