And if the previous bundles are anything to go by chances are they'll throw in Humble Bundle IV at some point or some more games.
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I initially thought the same thing, but considering that this is the most successful Humble Bundle to date ($3.1 mil and still over eight says left, likely due to the quality of games offered) I don't think we'll be seeing any extra bonuses. Not that it matters, really (at least not to me), but there isn't a stinker or even a "meh" game in the bunch this time.