Interesting. I don't know who/what Abeloth is, but I know who Krayt is. Since the title of this series is Fate of the Jedi, it would be the perfect time to kill off Luke, they've gotta do it sometime, as you said, their running out of time!

And if Krayt is the guy to make Luke become one with the Force, then that makes things rather poetic, given that Anakin had major issues with him in the Clone Wars and Cade ended up being the guy to kill him once and for all.

On the upswing of all of this, maybe if they kill Luke, the books won't focus on the OT characters as much, as they seem to be as drawn out character wise as much as they possibly could! We could have a new cast of fellows to follow!