Now its officiall, $LUNA will be airdropped across $LUNA Classic stakers, $LUNA Classic holders, residual $UST holders, and essential app developers of Terra Classic:

Token distribution details can be found in the governance proposal, but to summarize:
● Community pool: 30%
● Pre-attack $LUNA holders: 35%
● Pre-attack aUST holders: 10%
● Post-attack $LUNA holders: 10%
● Post-attack $UST holders: 15%

More info: https://twitter.com/terra_money/status/1529451631263174656