Thats the best reason I can come up with. Its certainly not a case of Toriyama forgetting or anything ridiculous like that.

Maybe, maybe not. It could still be Future Trunks from a different timeline, he just went back in time, just not to THAT universe. It's weird, but there is no way Mai should be that young. Hopefully they do some type of explanation on that later.

I guess Trunks and Goten still look young as teenagers because Toriyama probably does not want to give them new designs.

Yeah i'm pretty sure it is laziness, correct me if i'm wrong but isn't Trunks supposed to be the same age as he was in History of Trunks?

Super is set at Age 780 which is the year that Future Gohan dies in Trunks/Cell's Timeline. So Trunks and Goten should look a lot older now.

http://i.imgur.com/U9l4gkb.jpg
More fusions were announced for the new Dragonball game.

That Gohan Videl fusion needs to be made into an action figure it looks pretty cool.

at the same time though whis lready explain that the about the universe and future trunks in from diffrent time line with in universe 7 not from another univers from 12 mention as they are stand alone universe with every one out 12 is the same. at the same time the even future trunk mention are all from the cell saga due to stock footage. even this arc bulma ask if he had blue hair. trunks even remeber that he gave bulma cell time machine during that time.

Yes and no. Remember, Goku didn't suddenly age until he was 17.

I really want Fusions to come out in the West. The game looks like a lot of fun to play. I want to see a fusion of Freeza and Coola (Cooler) next. I always wanted a fusion of those two since Budokai 3.