The Annotum group has finished Alpha and Beta versions, and is now on to Release Candidate 1 They write:
We’re pleased to announce the initial release candidate for Annotum 2.0. Barring any major issues, v2.0 will be released on WordPress.org in the coming days.
The OAS will wait until the official release has matured before porting it to it’s servers. In the meantime, the demo version 1.1 is in place.