if you want publicity, go to your local babbages (or whatever you have) and ask about JJ:GBA. Seriously, that's the way to get it done. Bring your friends with you. Better yet, stagger your visits so it is impressed in the mind of the clerk/manager.

Person 1 walks in, finds manager : "Hey, do you know anything about Jazz Jackrabbit GBA? Will you have it when it comes out? Can I preorder?"
Manager: "Hmm..I don't know. Sign up for our newsletter and we'll get back to you!"

.5 hours later, person two walks in, repeat.

This sort of thing works because Babbages and similar video game stores are the engine of sales : if they think a game will be big they're going to order lots of it and give it good shelf space. And the way to make them think it's going to be big is by asking for it.