The next OpenStack Summit will take place in Austin, TX, US from April 25-29, 2016. The Call for Speaker period is still open and will close on February 1st , 2016, 11:59 PM PDT (February 2nd, 08:59 CEST). You can submit your presentations here.
The process to submit a session proposal changed a little bit since the last summit. You have to provide more information like "What should attendees expect to learn?", "What is the problem or use case you’re addressing in this session?", "Why should this session be selected?", but also links to former presentations. And you can submit no more than 3 proposals. Personally I have to say: This is really an improvement, especially if this information also ends up in the voting process!
I myself work currently on a proposal to speak about "From Hardware to Application in a OpenStack and Ceph NFV cloud". I hope we will see many interesting proposals for Ceph related talks!