Personally, I would much rather see full games giving incremental updates to the system instead of a reboot. One book to run them all is a lot less books then one book for each possible theme/topic/culture in 40k. Remember GW killed Dark Heresy once, the day after it sold out in two hours. FFG doesn't need RPG numbers to impress, they need numbers that don't look inconsequential to the miniatures execs as well as justifying a possible RPG-to-wargames tie-in. A full-blown IG game with all the vehicles in it, is just made for selling ridiculously expensive plastic vehicles to Roleplayers (who's gonna run a IG campaign without at least one Chimera?).
Now if they can just keep Ron Edwards...err I mean Jay Little's narrativist hands off the goddamn thing, they'd have a winner. They should include in the Collector's Edition an Imperial Infantryman's Uplifting Primer.