Glad to have you back SuperSmacker. There has been a few notable changes to the game. You might want to check #announcements where we post a majority of them. The biggest change we had is probably the addition of the AI league, where you compete in code championships to earn prizes.
In a sense of machine learning? Nope. The “AI” part was derived from the fact that players write algorithms that determine their action. I’m assuming the “algorithm” part was what they considered AI.
I don’t think there are any new concepts added unless you count Illia’s introduction levels. A lot of the team focused on Ozaria(Classroom-version), so there weren’t too many levels added. (Only around 7-ish new levels?)
@SuperSmacker! Welcome back. Wow, that’s a surprise. How are you?
And, as Chaboi said, there have been quite a few changes, including new heroes and items, and a few levels, maybe you’ve already seen them. (no progress on the volcano as of yet though…)