In an email, Kallahar confirmed he handed DEF CON Bots contest over to a new organizer and confirmed that organizer is forum user jotux.

jotux says DEF CON Bots to return to DEF CON 22 after several year break.

Forum Description:
Originally posted by Description
Under new Management. Planning, Discussion, Q&A and Status for the Defcon Robot Contest. More information at (site), (github)