JDK 7 has reached another the "feature complete" stage. Mark Reinhold explains what that means and what's left before the Developer Preview release in a month or so. Henrik also has a piece on this milestone, sharing his confidence that the announced roadmap (final version this summer) will be met.
You're encouraged to grab a recent build of OpenJDK (available also on Mac OS X), try it out with NetBeans 7.0 beta (familiarize yourself with project Coin) and possibly also with GlassFish (although clearly not yet a supported platform) and provide feedback for it all.
Note that Java EE 7 will likely require Java SE 7 (like Java EE 6 requires Java SE 6).