User blog comment:Chillmanfire/The End of Omniverse/@comment-2138661-20131111160002

From past shows, I can infer this;

Ben and Rook will have an intergalactic battle against an enemy that is leading a major threat. After much struggle, Ben will use either a new alien or a very powerful current alien to save the galaxy again. When that is up, Ben and Rook will have a final conversation, saying that they both enjoyed teaming together. They permanently part ways, and Azmuth appears, complementing Ben on another job well done, and gives him Ben 10,000's Omnitrix glove. Then, they show a certain amount of years later caption, depicting Ben, now Ben 10,000, as a main guardian of the universe, with Gwen and Kevin at his side.

I believe that the story will kind of have the thing that Danny Phantom had, in which Ben gets a statue of him on every planet, and every state, to commemorate what he has done.