Discord already mentions Ashlands being the next biome, does it not? The small patches that come before it are more unclear, probably the missing Mistlands upgrades and then who knows what.

They're still a little to slow with updates in general so I hope all the bugs and technical limitations that slowed them down have been handled and can speed it up a bit. EA game or whatever other reasoning you want to give, I still think it's not unreasonable to expect something more than such a terribly slow pace to updates