Extra Chapters?

[Fantastische Hure]

Since when? I didn't know, besides the Cell Jr.s thing.

This one's the future time-line fight.

dragonball.wikia.com/wiki/Extra_Edition_1_(Dragon_Ball_Super_manga)

&

http://dragonball.wikia.com/wiki/Extra_Edition_2_(Dragon_Ball_Super_manga)

There's also another, seemingly less interesting one.

 

[Captain Cadaver]

They're featured at the end of each volume. I've skimmed through the first volume in a comic store and saw it featured the extra chapter involving Goku and Kaio. Main reason translations aren't available online is that special content left exclusively for the Tankoban wouldn't receive much attention by those focused on updating an ongoing series, nor would Viz make them available online when they only make older chapters available by buying the full volume once it's out.

 

[Fantastische Hure]

Yeah. It doesn't really effect the story that much, other than maybe the third one, and since they are only released once the volumes are released they are already too late.

The Cell Jr.s one could still have been translated though so considering it wasn't released all too long ago.