At this point I believe the project is in the hands of Pinbits who are making them and selling them directly to those on the list. I got my notice and have received my kit, got it installed and have been playing Tron nonstop now.
The instructions are very minimal, they're online when you order them and not printed. There is a photo album with a lot of pictures available and that helps a ton. But some of the pictures would benefit from having some arrows overlayed on them so you know what you're looking at, the power plug that you have to hook up for example isn't obvious but after a while you finally 'see the difference' between the before and after picture. The light blocks aren't labeled right/left and the cabling isn't labeled either. So be sure you plug them in and power the game up to see which ramp is which before screwing them in to the playfield in case you need to swap them (or you could reroute the wiring to send the right/left signals to the correct block).
Otherwise everything installed very easily, and looked so factory it's amazing. No large bars or blocks or anything at all. The lights are bright and the colors are matched great with the modes.
I've been waiting for this mod to come out for so long, and now that it's finally here it was absolutely worth the wait. I think those selling this kit would be wise to keep communication open in this thread as to when folks might expect their purchase links to come out. If you're still waiting, I can only say hang in there. It is absolutely worth the wait!