The chips came in, and the jumpers of ebay
I already reprogrammed the 16u2 in my rev3 with a usbisp
I added a nonmomemtary push button across the right pins,
I selected arduino as isp in the ide, clicked burn bootloader
then uploaded a fresh blink sketch
100% perfect success, I think they should add this to rev.4
Then since it will come preloaded on the 16u2 just about anyone who buys an arduino can very easily burn bootloaders without any additional hardware or isp their own board for some extra space,
excellent and thank you for this project!