These are the release notes for the development releases of PmWiki 2.0.
First, this is definitely still in the development stages, so many things are likely to change between now and the official releases.
Second, at present there's not a good way to upgrade from PmWiki 1.0 to PmWiki 2.0, although upgrade support is expected to arrive in future (development) releases. So, you can use this version just to see the new developments and gain some experience, but migrating from 1.0 to this version is still likely to be a bit of a chore.
Bugs and other requests can be reported to the PmWiki Issue Tracking System at http://www.pmwiki.org/pmwiki2/pmwiki.php/PITS. Any help in testing, development, and/or documentation is greatly appreciated.