Wireless bluetooth kickstarter
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Thought people here might interested in this kickstarter - its arduino compatible bluetooth board that has implemented the midi bluetooth protocol as well as the hid, so it can show up as a wireless midi device to your computer, and has lipo battery support as well.
https://www.kickstarter.com/projects/1966384672/a-bluetooth-arduino-for-the-mobile-age-lightblue-b/I don't have any connection to them, it just looks interesting.