The Bethesda Blog announces the tournaments to be held at QuakeCon 2013, two of them in QUAKE LIVE, and in a fit of old-school awesomeness, one of them a 20th anniversary DOOM tourney using DOOM 3. Word is: "Players can register for the Intel QUAKE LIVE Duel Masters online. Registration is extremely limited, so sign up as soon as possible. Registration for the QUAKE LIVE Clan Arena 3v3 Open and the 20th Anniversary DOOM Challenge is first come, first served, on-site registration only. Interested parties please visit the tournament area on-site at QuakeCon from 10:00am to 3:00pm CST on Thursday, August 1st for tournament registration." Bethesda also announces John Carmack is going to be giving a second technical presentation this year, in case any minds are left unblown by the id Software technical director's keynote:

We’re excited to announce that in addition to his annual QuakeCon keynote address, John Carmack will return to the stage for lecture-style presentation focusing on light transport and rendering.

Titled “The Physics of Light and Rendering”, the talk will take place on Friday, August 2nd at 5:00pm CST. Learn how light behaves in the real world, and the approximations and compromises that are involved in simulating the behavior with computers. This lecture will be geared towards those interested in the interactions of light in the world and how computer software simulates it. Note: Not for the technically faint at heart. :)