From our Announcements section on discord:

At block 4800 we will start the process to AIRDROP coins to all wallets. (aside from premine) Every wallet will receive a transaction of exactly their balance at the time of block 4800. Logistically this makes the most sense for us the community and pool operators.  @everyone  More news to come! This is the final call on our block 4800 airdrop!

The b-hash team has decided to include a 25% bonus in the airdrop. Simply put. If you have 50 HASH in your wallet at block 4799 you will receive an airdrop for 50 HASH as well as an extra 12.5 HASH bonus. Resulting in 112.5 HASH. The airdrop will be distributed promptly. It will not be in your wallet exactly at block 4800 though!! I hope this clears up some confusion for everyone!