Check out this thread over at WotC's d20 future board that discusses what is 'missing' from d20 future. If you get in on those ideas early, you'll be 1 step ahead of everyone else.
It depends on the setting. I'd love to see something like Homeworld and/or StarCraft adapted to D20. Something other than a pdf or fan created write-up. A big full color hardback would be nice but also a pipedream. Fading Suns, Heavy Gear, Trinity and Jovian Chronicles all have D20 adaptations but not D20 Future adaptations. Like I said, pipedream.