Obviously implies (or is meant to imply) that the story revolves around Luke, perhaps even more than one would expect (which is fine by me).
Or, given that this is the second (usually "darker") film in the trilogy, it could be that the "last Jedi" at the beginning of he film (Luke) is not necessarily the same person who is the "last Jedi" at the end of the film (Rey) (which would also be consistent with the rumors that Leia, rather than Luke, played a pivotal role in confronting Ren in the third film.)
M
ETA - interesting that the "Star Wars" is in red, rather than yellow, font. Not unprecedented but - will we get blue for the third film? A nice taupe, perhaps?