This is old news. Entire pre-mine is now being distributed through the promotional bounty based airdrop. Devs have also bought back all mined coins in Oct'17 for 1 DOGE per MTC. Not able to find the BCT post where they had put up the notice for buyback at the moment.
Total coin supply: 10 Bn
Coins to be distributed through airdrop: 9.5 Bn
Dev will retain: 100 Mn
Still undecided: 400 Mn
So far distributed through airdrop: 1.5 Bn
Block explorer: https://explorer.marinecoin.info/