TL;DR
Valve technical specialist Mike Morasky mentioned HLX during a Q&A on October 21. HLX is a rumored code name for a Half-Life 3 project, though Valve has not confirmed this connection.
Half-Life · official art via IGDBValve composer and technical specialist Mike Morasky mentioned HLX during a Q&A panel at GameSoundCon on October 21. While discussing audio systems and HDR implementations, Morasky said Deadlock has its own version of HDR and that HLX has its own version as well.
HLX is a rumored code name for a Half-Life 3 project. Dataminers have found references to HLX in Valve files for years, but Valve has not officially confirmed that HLX is Half-Life 3.
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