If you have an idea for a GDC talk, poster session roundtable, etc... the submission form on www.gdconf.com is open until Midnight (Pacific Time) on August 27th, 2016. Please submit! I'd love to see a very strong slate of TA presentations for next March.
Also, please read the Bootcamp thread, I've asked for speakers who would like to be considered for the Bootcamp to post their topic ideas there. Speaking at the Bootcamp does not preclude you from also speaking during the main conference, if you'd like to do both.