Although no replacement for 100LL has yet been identified, Lycoming's Michael Kraft thinks it's possible that multiple competitors could enter the market with different fuels meeting the same specifications, thus fostering price competition. In this podcast recorded at Aero 2012 in Friedrichshafen, Germany, Lycoming's Kraft said that although it hasn't released its formal report, the FAA's leaded fuel transition Aviation Rulemaking Committee will recommend a transition process that could, conceivably, have several competitors providing different sources of unleaded fuel to the market that meet the same performance specification.
This is a companion discussion topic for the original entry at https://www.avweb.com/news/lycomings-kraft-competition-may-make-100ll-replacement-cost-competitive