Could "The Last Jedi" refer to Luke, or Rey?

Or could it refer to both of them, since Jedi is both singular and plural?

At this point, it's impossible to tell if it's singular or plural. I hope that the movie gives a better indication of the meaning behind the title than The Force Awakens. (It's Rey's "Force" that awakens, right?)

At the end of ROTJ, Luke's (at the time) new, green lightsaber is dangling from his belt. Perhaps he's held onto that one.

Hayden Christensen is making an appearance at the upcoming Celebration:

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"Hayden Christensen (Anakin Skywalker), star of Star Wars: Attack of the Clones and Star Wars: Revenge of the Sith, returns to Celebration for the first time since 2002."

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Curious.

I think it's just as the official site says - He'll be there as part of the 40th anniversary panel.

Welcome back to the fold HC as DV

I’m not sure why the writers thought that Yoda was the natural choice for the Force ghost. Either they didn’t understand the narrative trajectory of the original 6 films, or they simply believed Yoda was the more popular character for the target audience.

I’m not sure why the writers thought that Yoda was the natural choice for the Force ghost. Either they didn’t understand the narrative trajectory of the original 6 films, or they simply believed Yoda was the more popular character for the target audience.

My guess is he was easier for ILM to recreate than Obi-Wan. Plus, how old do you make Obi-Wan? McGregor-young, or Guiness-old? As he is designed, Yoda can be relatively timeless/ageless.

It's a puppet made from the ESB mold.

You went with The Empire Strikes Back version of Yoda, the ornery version.

That felt really important to me. And, actually, I cut some of that out and Frank Oz said to me I had to put it back. Because when I first pitched him the scene, it’s like the Yoda from Empire is back because that’s the one Luke had the emotional connection with. And that’s why we did the puppet and recreated the Empire puppet: Neal Scanlan and his team did a recreation of the Yoda puppet. It’s not only a puppet, it’s an exact replica of the Empire puppet. They found the original molds for it. They found the woman that painted the original eyes for Yoda. Then Frank came and worked with them for a few weeks to get the puppet right. He did a lot of testing and a lot of adjusting with the puppet creators. It was amazing to watch the process. The idea that the last time Luke saw Yoda was in Return of the Jedi and the notion of getting back to that version of Yoda to form the emotional connection with Luke – including a glimpse of the impishness, as part of their relationship. It made a lot of sense.

Post the prequels, I think the narrative choice would have been Anakin appearing to Luke

Yeah, Rian Johnson confirmed it in this interview from uproxx

Yes i agree, but then, according to Lucas final version of ROTJ, you'd have to use Hayden, and then you'd have the problem of Anakin appearing to Luke and give him a speech about Rey and Kylo, just to have Luke say: "... and you are...?"