Open Hardware Summit 2015 will be on Saturday, September 19th in Philadelphia according to the @OHSummit Twitter account:
Hope to see you there! More details will be announced in the future. Follow the @OHSummit on Twitter or continue to check the Open Source Hardware Association website:
In the meantime, you can watch the talks from last year in Rome online:
All Open Hardware Summit 2014 videos are available!
Cheers,
Drew