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There are a few smaller tuner shops that have released theirs but I think the big name tuners are still in R&D. I think it'd be wise to wait a bit as the long term R&D and field testing may pay dividends for those concerned about power train longevity and/or drive-ability or just plain they've discovered a better tune than their initial run.
Big horsepower and torque gains aren't everything if the motor/trans won't survive long thereafter or the drive-ability is compromised. Not saying the motor/trans is likely to do that or that any of the current available tunes by shops are bad but it should be something to seriously consider for a savvy M5 owner before shelling over the $$.
I think a great idea as various tunes come out is having a database just like IND did with the exhaust database. That way customers can compare dyno sheets and decide what kind of tune might be best for their driving needs.
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