Francis Heylighen agreed to be Speaker at the Summit. Being famous for having created the Principia Cybernetica Web, a genuine body of knowledge about complexity, he is the Director of the Global Brain Institute that was founded in 2012 at his university (Vrije Universiteit Brussel). See here a short description of the GBI.
Resuming research in collective intelligence, Heylighen deals with the role of the Web. Read, e.g., his paper on the so-called singularity.
He adds to the list of 10 Speakers already confirmed. See here.