John Carmack's Keynote from Quakecon 2011 mentions Quake 5 is not planned and merely speculation. Let us contemplate the possibilities so that our collective thoughts may be known in the future despite the dreams of the present. What would you like to see in Quake 5? What ideas can be taken from previous Quake titles for renewal and improvement? What ideas can be taken from other popular, successful games? What is required to attract a large number of players and retain their interest? What is essential to make it the “definitive FPS of the decade” and potentially the greatest in history?

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Working on multiplayer and co-op next. I'll keep my ideas updated. I'll start compiling collective ideas afterwards.