These character cards appeared just before Christmas, however they are subject to change as they have not been officially confirmed by Knight Models yet. Furthermore a Doctor Octopus was also mentioned, however a character card has not yet appeared. Once these cards become official I will add them to the team builder and links.
Update (06/01/17) Thanos' Titan Punch and Cosmic Rain have increased their damage by 1 each. Cosmic Rain's range has been increased from 8 inches to 13 inches. Finally Titan Beam has had the error removed from it's Spray range.