The pearl color is approved and the keys are now going into production! The key color is a match to the original XT set used on the prototype classic case F77 I brought to the various meetups (two keys shown below for comparison to the new keys). As noted earlier, pebble/gray and Industrial SSK blue were approved (a match to the IBM Industrial SSK Model M blue custom function keys). 60% gray was also approved.
The assembled springs first batch should be going out in a week or two. The factory has produced three of the spring attachers so far (from the video posted earlier).
As always please disregard the colors in these photos as they are not 100% accurate. In person the keys are a match.