Wait, I just noticed, Java 7 uses dylib by default now instead of jnilib. Based on the fact that when I finally did get it to load with Java 7 the old jnilib format still works, but I'm wondering if maybe we could build a 64 bit Java 7 version as dylib after we build the Java 6 32/64 bit versions. Also, I don't think it's been mentioned, but Java 7 on Mac does not have a 32 bit version, this could possibly be because a 64 bit processor is required in OSX Lion and up, so there wouldn't be much point in releasing a 32 bit version for platforms that require 64 bit anyway.
Here's the second issue: By default, LWJGL is going to want the full JDK installed on Mac in order to run with Java 7, due to the differences in how Java 7 is implemented on Mac versus Java 6. Basically, installing the JRE seems to only install a copy of the internet plugin, which is located in a different place than the JDK, and you have to build against a specific location for the libraries to sit otherwise it won't know where they are. The main problem being that I also don't have any idea how to package the JRE with LWJGL in a way that allows it to work like it needs to. I'll keep looking at things to see if there is another way, but I'm not sure if I'll have any results.