Java 7 (Dolphin) is apparently due out this year.
For whatever reason, I've just been particularly curious at what is all on the horizon. Unfortunately, there doesn't seem to be much of anything currently available at java.sun.com. While jdk7.dev.java.net would be the next appropriate site, I've not been able to find any summaries there beyond a cluttered change log.
After some additional searching, I finally came up with a few links that may be of interest:
- Alex Miller - Java 7 (tech.puredanger.com)
- "Java SE 7 Language Features" - PDF of a presentation done by Sun at EclipseCon (blogs.sun.com, 2007-05-06)
- Rémi Forax's Blog: JDK7: language enhancements (weblogs.java.net, 2006-09-06)
See also: Java version history @ Wikipedia (Good summary through Java SE6, currently no details for Java SE 7.)