https://www.merrymayhem.com/new-years-day-mystery-quilt
This link will tell you everything that has been posted so far. No colors announced that I can see. Everything gets posted on the website so you do not need an app or facebook to participate.
Phatquilts2 -- If you have a big enough local group, they are offering a licensing program to use as a shop or guild event. There is info on the website about it. I am in no way affiliated with this event... I just hope to participate, as always, but end up accumulating the patterns only. It is really fun following what happens in the quiltingboard thread. Do a search for Merry Mayhem and you'll find the older threads. Our online quilting gang is so productive and entertaining. Quilting online is free of covid and flu, too!