Since the information on the articles has already been listed, obviously I can say it, but I must warn those who haven't seen the movie yet and don't want spoilers to avoid this page.
Though the spoiler tag at the top of his page as good as say it anyway.
Without any further ado...
Hoping the critical points don't show up on the blog index...
Here we go.
There is a post credits scene in Dead Men Tell No Tales where Davy Jones's shadow is seen, in his tentacle form. Will wakes up, and is sure it was just a nightmare, though barnacles are seen on the floor.
Now, it is conceivable that he could be resurrected, because Calypso revived Barbossa already, and she was in love with Jones, although it was also believed they reunited peacefully in the afterlife.
However, there are two gaping holes in the theory that he came back from the dead by any means.
First, why is he still bound to the Dutchman? The destruction of the Trident of Poseidon broke all the curses, including releasing Will from the Dutchman. If Will is no longer bound to the Dutchman, why would Jones be, especially since his death released him from that?
Second, I remember it was stated that Dead Men Tell No Tales would be the final film. So, if he is still alive, there won't be a sixth film to explain why and how.
My personal thoughts:
They just threw that in to shake things up, to leave the audience guessing, just like in Gravity Falls when Bill Cipher is definitely killed but says backwards "A X O L O T L! My time has come to burn. I invoke the ancient power that I may return!"
In-universe? If it wasn't a nightmare, as implied by the barnacles and sea water, it was probably his spirit briefly appearing from the other side to haunt him just this once, now that Will is free from the curse he was under for so long. Yeah, that's what I'll go with since they're leaving it up to our interpretation.