if you don't have some local hackerspaces to get in touch with someone who will make you a personalized DIY midicontroller and you aren't as much interested in electronics to be able to make your own you will have to wait ~1-2 years until its boxed in the store for the customers
i think their are already some big players developing this products for the market, for sure ;o)
Here you will find a very large international list of hackerspaces:
http://hackerspaces.org/wiki/List_of_ALL_Hacker_Spaces
there you will find the contacts and know how you need ;o)
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