(You are finishing ufo's, aren't you while waiting for the mystery?
You know you should...
Oops, just cast on for a new sweater, did you?
No, I won't tell anyone!)
Here are some previous mystery mittens to inspire you while we're waiting:
Den hemmelige hagen (The secret garden)
More versions on Ravelry.
En gåte på en måte
This was the first mystery in the I make mittens group. More here.
Soria Moria Vott
Soria Moria Vott - to celebrate Vottelauget's first mitten e-book. Lots of mittens here.
Advent Mystery Mitten in collaboration with Vottelauget.
Only in Norwegian - if time permits coming in English for next Christmas. See more here.