Oh, the rest of them...at least Red Bull, McLaren, Mercedes, Sauber, Torro Rossa and probably Sahara Force India and Williams...will have it sometime during the testing period/season I'd bet. Maybe not in time for the first winter test, as it looks like the plans for it might have to pass FIA inspection beforehand..but, they'll have it eventually.
Ferrari still says they're waiting for final approval on the system from the FIA before adapting it to their 2012 car, but the FIA's already stated it was within the regulations.
It'll be the minnows that suffer the most..hell, Virgin still isn't going to have KERS in 2012.
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"Sometimes I wonder whether the world is being run by smart people who are putting us on, or by imbeciles who really mean it."
Mark Twain