What if and hear me out on this…Shiro doesn’t die. I mean sure it sounds like it judging by what he said in the beginning of the trailer but once you gave more thought of it it is impossible for Keith to lead Voltron. I mean it can mean alot of things but my theory is that Shiro wanted him to take over the black lion. But who will pilot the red lion if Keith takes over the black lion. I mean I have never heard once in the series that one lion had two paladins nor have I heard hat someone can just take over a lion

Anywho then we have the shot of Shiro crying. I have two possible theories. The first one being Shiro is about to be brainwashed by the Galra and that message to Keith was his way of saying good bye (Ah the Shieth feels). My second theory is he is about to be executed by the Galra. and the others come to rescue him.That is what I believe. Team Voltron to the rescue!!!!. I mean Shiro is one of the five main characters…it seems insane for the crew behind Voltron to kill off one of their main characters. Unless…Josh Keaton can no longer be in Voltron. I have heard and seen alot of shows that kill of characters when either the actor can no longer be in the series or (Like did you see Glee???)   if the actor has other roles to do. 

But hey it is just a theory….a Voltron heory

Thanks for reading.