What is happening is the same thing that had to be done to convert to squashfs, then to add time stamps to the files of those converted from cramfs, and then also to add correct permissions of /usr/local/tce.*.
This is what I hope is the final repacking of extensions, this time was to use 4kb block size to take advantage of a substantial memory use reduction when using mounted mode. The whole purpose of mounting extensions instead of copying to system is memory efficiency. Memory use upon loading extensions is almost cut in half when this new block size is used. It also seems that during runtime use of apps memory use has also been lessened, though that is hard to quantify in numbers.
Though by doing this there are new time stamps on the extensions in the repo, I think that the benefits are worth going ahead and making it effective on all extensions.