Someone told me that Goku goes to High School in the Movie... Tell me it isn't so.

It's true.

I'm expecting National Lampoon's: Dragon Ball now.

Well they kinda had to change the story a bit, they can't use a real 8 year old for that part now can they :P.

Please tell me that the green guy (I think he's called pickalo), the alien (fageta, or something like that) , and the pig are all included, purley because they're the only non main characters I remember from watching the show back in primary school.
I'd love to see the action seens though, probably take the entire movie for one face off, it seems that long in the recent shows anyway (Seriously, who takes an entire season to fight one lousy badguy?_

Piccolo will be the main antagonist Fageta I assume is Vegeta who made his first appearance in DBZ not DB and the pig, who I can't remember the name of, is in DB so I'd assume he was included.

The pig is Oolong and I don't think it's been confirmed that he'll be in the movie since he doesn't have a very big part in that part of the story I think.

I hated Dragonball. But Dragonball Z is another story. :)
Is it just gonna be about DB?

Yup. If it's a hit there's likely to be a sequel, but I doubt this will be anything fancy.