i havnt really had time lately to do much with it, I did get the USB Network Stick working with the kext attached to a previous post (thanks to the person who found this) in this thread (the IONetworkingFamily Kext did not include the Axis kext though, so had to include that manually).
I was rather amazed that I could boot Mountain Lion in VMWare Workstation 2012 Tech Preview directly from the install on the partition without issues (patched vmware to show macosx as OS option), this is rather neat, also installed VMWare Tools and they work fine and dont interfere when I boot Mountain Lion natively
Audio could probably be made to work, I just saw some threads on another forum around ALC269, if you google "ALC 269 Patch for AppleHDA(May work idea for others" is the first result, its a bit too complicated and time consuming for me to pursue right now, as audio is not a high prio for me
The touchpad is working for me, just no gestures or two finger scrolling etc, so basically its just working like a mouse
The battery % could be enabled with some kexts for that, dont know where to find it, but remember reading about some kext that enables battery % on notebooks in general, so that might work
Re Sleep: At some point Sleep was working for me, potentially remove the ACPI kext copied from the UB stick to /E/E (leave the PS2Nub thing for the PS2 Keyboard/Mouse support I guess), other change I made was to change SMBios to Macbook Pro 2012 Retina Model instead of Macbook Air 2012, something around those things broke sleep/enabled sleep for me again. I also put a DSDT (just the fixed one I dumped with some tool), I didnt really see that changing anything, but maybe that was part of making sleep work too