You are correct. The updates have stopped. Without the source code, official updates and bug fixes to the game are impossible.
However, thanks to the lovely and creative users in the community, there's no limit to what can be created. And downloading these mods is entirely optional, which is even better!
You can to pick and choose what you enjoy in your game, as long as you're sticking to the rules.
There's even new animations to make your character move more fluently!
Like I said before, the possibilities are endless, and the amazing people here add onto it everyday with amazing ideas and projects. <3