My original plan was to finish isolating the original script, update and rewrite it, and then release on whatever version would been out by then (I'm about 110% sure that it will be newer than 6.60 at that point). However, if it seems like demand is high enough and people are willing to play against AI bots that don't make use of the new features or abilities (Razor's AI, for example, will be more or less completely broken), then I can continue to back-port features, at least for the purpose of trying new items and builds on something.
Problem is, this back-porting will take a long, long time (given the amount of changes, I'd say at least two months), time that I can spend furthering development on the script itself, so it's a significant fork in the road.