If, you know, the film actually gets made and the studio offers the directing gig to him, then director Sylvain White may sign on to direct. Maybe.
In any case, here’s what White has to say on the project when the boys at IESB (via SciFiWire) cornered him at WonderCon over the weekend:

So what’s been going on with the live-action versions of “Robotech” and “Cowboy Bebop”? Not a whole lot, as both movies seem to still be in the very early stages of development (i.e. scripts are still being written), but
It looks like Tobey Maguire’s “Robotech” live-action movie is still moving forward, this time there’s news that the project has nabbed its writers — Alfred Gough and Miles Millar, the creators of the WB’s Smallville TV show, which followed the adventures of a pre-Superman Clark Kent. The duo recently just bailed from the aging TV show (seriously, how long is Clark Kent going to keep pretending to be a teenager? Isn’t the actor playing him like 30 or something by now?), and recently contributed to the most recent “Mummy” film, as well as Maguire’s “Spider-Man 2″. So yeah, they know how to write superheroes is what I’m trying to say.
Yeah, I’ll admit, the idea of a Robotech live-action movie gets me into all kinds of good mood. The kind where I run around and punch babies, and when their mom complains, giving them a nice pinch on the bottom. Yup, that kind of good mood. To add further to my good mood, here’s a rumor that Lawrence Kasdan, renown writer of “Raiders of the Lost Ark” and “The Empire Strikes Back”, among many, many others (he also wrote and directed “Silverado”, one of the best cinematic Westerns out there), has been drafted to pen Tobey Maguire’s “Robotech”.