From the post about the update on the first season, they're focusing on the rewrites of Seasons 1 & 2. They said that the rewrites for the first season, which are still being worked on, are pretty significant but the ones for season two aren't as significant so it won't be as long a wait for that. You can read about it in the latest update notes for season 1 where they go into the 4.0 update, which also has an external link that talks more in depth about the update.