Well, it's released: Java 1.4 overview from Sun. From the first paragraph of the article:

212, 504, 1781, 2130, and now 2738. These are the number of classes and interfaces in the standard edition of the Java™ platform, from versions 1.0 through 1.4.

That's too many. Stop now. It'd be really cool if 1.5 had 500 classes, and a bunch of optional modules.