I think they've decided that, at this point, Java is within a few years of being a floppy disk drive in the iMac era.
Okay, that's a little harsh. But apart from Android, Java doesn't seem to have much buzz these days. And Android gets into the whole lawsuit mess.
Also, there seems to be a lot of disruption in the Java space due to the Oracle acquisition. IBM ditching Harmony for OpenJDK, the Oracle/Google lawsuit, etc.
This seems like an opportune time to step away. Since the whole Java ecosystem is stirred up and reconfiguring, it makes sense for Apple to pull back before a new configuration has solidified. While things are fluid, let the Java organizations figure out what they want to do with OS X.