So I posted this theory in the TFA G R A F L E X thread, & thought I'd bring it over here to see if it holds water, since I can't really discuss spoilers over there.
A bunch of discussion has been going on about some extra parts seen in the trailers & some promotional material. Mainly, a small antennae looking thing sticking out from the bottom of Luke's old saber. Thing is, it's not in the shot of Maz handing the saber to Leia in the first trailer. I'll save you some time & summarize the discussion from my point of view- It went from :confusedto:wackoto:facepalmto:angry & back again.
I had the thought, what if the saber we see Finn with, is a decoy? We believe that Kylo wants the saber. Much is made about keeping it hidden, like inside BB-8, & it's importance to finding Luke, which some believe Kylo is trying to do, too. If Maz is some sort of Jedi-Mystic, maybe she would have the means to make a faux-saber to distract Kylo from the one carrying the genuine article. Then Finn would be the one to volunteer, maybe to 'make up' for his service to the First Order.
In some of the promotional material, & in the Celebration costume display, that he's seen carrying it openly, in the front of his jacket, for anyone to see. I'm also thinking that may be why there hasn't been any Luke sabers included with the first action figures that have come out. I mean if it's the Maguffin of your movie, you'd probably want it with at least one of your hero figures, but so far, it's a no-show.
Anybody heard any thing to confirm or contradict?