6.58 is out, and I've started some of the porting work over (but probably won't be done for a while). However, I'll probably use 6.57b for my own AI tinkering, so any potential proof-of-concept maps will be with 6.57b.
I'll try to keep up porting in the meantime, so the community will at least have something to play/practice/pwn bots on. I doubt I'll be able to maintain two separate maps in the long run though, so we'll see how this project turns out.
I'll probably post an incremental map for 6.57b later today.