As for OpenJDK, Apple says that it plans to contribute most of the components required to properly implement Java SE 7 in Mac OS X. That includes "a 32-bit and 64-bit HotSpot-based Java virtual ...

When developers noticed Apple was deprecating Java on OS X, there was quite a mess on the internet. Today, Apple announced that is joining Oracle to bring the OpenJDK project on the Mac in order to ...

Use a Terminal command to see which programs on your machine are already compiled for 64-bit CPUs.

As a result, in the most recent 2010 Mac Pro systems Apple is changing the default kernel to be 64-bit, and perhaps we will see this be the default for other systems in the future as well.