Yan Fang, AFAIK, it's just a policy thing. We discussed at length, and there were several dissenting views (Jay Kreps, E. Sammer, Martin Kleppmann), who preferred to at minimum, set a date, and communicate it broadly. We've done that (June, website update, meetup notice). At this point, it's just two months out, but the broad notifications just started a month ago. IMO, it's probably worth just waiting the two months to be good citizens. After 0.9.0 release, I think we should just move master over immediately, and the next (0.10.0) release will fall right near June, so it can be JDK7.