Dev Content
This new method should be great for anyone who wants to make their own updates - you can easily peek into the system image and make changes at will, then just install the new system image! You can even rolll updates instead of an entire system image if you wish.
The script language in ClockWorkMod is called "Edify", see
this thread to learn about the syntax. This is related to the META-INF folder you see in the update zip.
There's a few differences in the rootfs', the main being the init. There's also some additional files it looks like neopeek added for Recovery specifically.