Barcelona (Spain) will be the venue for the next OpenStack Summit this October (25.-28.10.2016). The "Call for Speakers" period started. You can submit your presentation here. The deadline to fill your application is July 13, 2016 at 11:59 pm (PDT) / July 14 8:59 CEST.
In May there was a long discussion in the community about changing the selection process for the presentations, especially about if there should be a voting at all. The process changed slightly compared to Austin, checkout the current selection process.