I sent an email. Nothing (not even the msg "You may request now, but we won't be sending them until the day itself"). I just got an email saying it out on steam (wishlisted it). Clicked to download in the Itch.io page and saw the steam key button, Logged into steam, Get the msg "There are no keys available at this time, try again later". I mostly want it on steam so A) I don't have to download 1.79GB each update and B) Achievements.
I'll try over the next few days and hope I get a key (and yes I picked it up the day it was out on Itch.io)