According to a Medium post

LUNA 2.0 listing and Terra airdrop distribution schedule

According to a Medium post, eligible holders of LUNC (Luna Classic), USTC (UST Classic), and aUST – will receive the LUNA airdrop on the new chain upon genesis.

Terra Chain 2.0 and LUNA Airdrop Approved for May

Terra 2.0 Reveals LUNA Airdrop and Launch Date

Terra 2.0LUNA Airdrop - Medium

All You Need To Know About Terra 2.0 and the LUNA

Terra Luna 2.0 Airdrop – Answers to Most Common Questions