Well, in the future, it is a time of peace. Everyone is living in harmony, and no major threats had shown their faces for centuries.
Fighting (not fighting fighting, but like DBZ fighting) had almost disappeared entirely. There is now inter-universal travel, but only between pair universes (ours will take place in 7 & 6), so trading had become a major part of the lives for most of the beings in each universe.
The Namekians decided that to keep the peace, they would get rid of their Dragon Balls entirely. Now, the only Dragon Balls that exist are the Super Dragon Balls, and only a handful of Namekians even know how to create more.
Saiyans even stopped their fighting ways during this time of peace (well, that's because every Saiyan is a half-breed, and there is the calm and reserved Universe 6 Saiyans)!
It turns out, one of the Cell Jr's that Gohan fought, survived! They escaped Earth in one of Capsule Corp's ship, and went all the way to distant planet! Now, there are Bio-droids roaming the whole planet, each having at least one characteristic of Cell. They even know all of the Z-Warrior's techniques. They're surprisingly a calm species.
All of Majin Buu's Booby-Booby creations now inhabit a planet of their own, but it is so far away, that barely anyone is able to reach it.
Goku, and the rest of the Z-Warriors, have not been forgotten, however! Throughout both universes, they're seen as heroes (and yes, Mr. Satan is still the beloved champion)! Even if no one is fighting as hard as they did before, they would never forget what they did.
IT REALLY WAS A PEACEFUL TIME! Until....
And yeah, that's all I have.