I think that it hasn't been officially announced. At least I didn't see a thread or update about it but I found this google document
https://docs.google.com/spreadsheets/d/1tmT5frUmr5dSDAm44Bl3QUA_QeQOEuLeaQ7JupbySvQ/
which has been made some time ago and has been changed couple of days ago.
Deeper also mentioned that Friday airdrop participants will get rewarded more on the Sunday airdrop than regular members who
doesn't participate in the Friday's, it also was in the google document but it was deleted so let's see.