Actually this applies not just to new bookings, but old as well.
I just activated mine today, and i just got an email with over $4,500 being transfered into my account, so i logged in here to check my account, and it's there, so not some scam email. And i only got one booking today, for Sept check in.
So that means the amount in process right now is for old bookings , not new.
Another thing to note though, i realized in the email that there were small amounts deducted, that is each booking seems to be charged that 3%, not a lump sum.
As in, if they were transfering say $4,000, i thought they would simply take 3% from that amount, but that's not the case, they take an average of $8 from each future booking that there are paying me early for, so when you add all that $8- $15 together, Airbnb just made a killing.
Some of those charges went as high as $18. Once this transfer is done, i will probably shut down early pay.