The first Apibot version available to the public is 0.30b1. (It had to be 0.20, but the writing of the documentation led to discovering in the bot so many bugs and bad code, that it was almost completely rewritten.)
Version 0.30b2 added a lot of new wiki info functions, and some data manipulation. The greatest changes, however, were in the iterator framework. The actionobject classes were redesigned, and made much more useful. Some new ones were added.
Version 0.30b3 added support for MediaWiki parameter info services, an experimental bot test mode and a lot of bugfixes. There were also minor reworks in the iterator framework. The base bot module is believed to finally approach some stabilization of its API (in other words, your scripts that use it will not need a complete rewrite with the next Apibot version :-) ).