Check out this new information just confirmed on christmas day!
Someone recently tipped me off to a reddit post suggesting there was info on unconfirmed albums in the client already and after stuffing myself with food I can confirm I have found said information! There appears to be the data suggesting at 2 more albums, no reward data is visible at the moment, though it does seem like will be the reward for that album, also i think they probably messed up on including the winter destroyer instead of the steam punk one
Pixel X-Men
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Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk
Steampunk