Can somebody fill me in as to what happened on "Naruto: The Last"?

[AaaaNinja]

New characters, new developments, etc.

I really don't have time to watch it, and I'm confused by some stuff in Gaiden (like the onion head Uchiha).

There's nothing in The Last that will clarify anything that is going on in Gaiden. The Last doesn't have any new characters and nothing happened that you can't figure out from reading the manga. People getting married is a manga development. The courtship (movie) is the fluff because you can deduce that it went on without having to see it.

All of the Uchiha stuff is originating in the Gaiden series, it's completely new.

 

[Anastacia]

New characters, new developments, etc.

I really don't have time to watch it, and I'm confused by some stuff in Gaiden (like the onion head Uchiha).

Naruto went to space, they had a Konoha space program and were able to create a spaceship and travel to the Moon. There naruto met the moon people, not the nicest people on Earth, but hinata married one, nonetheless. the moon people wanted to grow vegetables so they mixed the onion DNA with an Uchiha survivor. let's see what happens next!

 

[Endles Waltz]

It's not important, the events that take place are not related to Gaiden at all. Maybe the one thing that connects to Gaiden's plot is Naruto and Hinata getting together while Sakura is still waiting for Sasuke, then in the movie credits we see all couples together except for Sakura who was alone, what a surprise. :lol Meanwhile Sasuke is traveling a desert.

I guess we should have seen this coming huh?