The Milestone 2 release features tons of great bug fixes and enhanced functionality. You can check out the release notes here: https://github.com/OpenNTF/org.openntf.domino/wiki/M2-Release-Notes
People keep asking us "can I run this in production?" I, for one, am finally prepared to say yes. Red Pill Development has integrated the API with our next version of redpill Mobile to great success.