On the Friday prior to the 2019 24 Hours of Le Mans (14 June, 2019), the full technical regulations regarding the new class were unveiled at the race's press conference. The regulations were teamed with the announcement of Toyota Gazoo Racing and Aston Martin Racing committing to the category for its inaugural season, then-to-be the 2020-2021 WEC Season. Aston Martin confirmed the use of the Valkyrie road-going car as the spine of their hypercar, whilst Toyota hinted at the use of their GR Super Sport concept. The two manufacturers would join the supposed Glickenhaus team and ByKolles racing for the first few races.