Good news — we’ve got a release date for Pictureka Museum Mayhem! According to this Pictureka marketing page, the game will be released in approximately six and a half days (at the time of this post). So, look for it on November 24!
In the meantime, you can visit that page daily through November 23 for 2,000 free tokens each day. (There’s a similar promotion for the UK site, but unfortunately you can only get tokens from one, not both sites.)