The title is great, obviously it stirred up a ton of discussion across social media, as well as what the plural form of "jedi" actual is. I believe since the plural of jedi is jedi, it is not saying there is only one left, but these are the last of the jedi (more than one, but very few).
I do not believe that Luke will die in TLJ, especially now that Carrie Fischer is one with the Force. They need an OT character/mentor to make it through til IX. I suppose he could still operate in that capacity as a Force ghost a la Obi-Wan in ESB, but I doubt it.
Another thing that intrigues me about the toy-box art is that Finn looks relatively fine after his lightsaber-induced spinal injury. I thought he would perhaps some kind of exo-skeleton or cybernetic enhancements.