The util-linux-ng project was officially merged into util-linux in last days. It means that there is no more -ng fork. Fortunately, the change was pretty simple, because the original util-linux project was inactive in last four years. It was enough to rename mailing list, git repository and directories at kernel.org. Note that the old addresses still work and all is redirected to the new stuff.
The last remaining problem is to rename the mailing list at gmane.org (http://news.gmane.org/gmane.linux.utilities.util-linux-ng/). I don't want to lost the list history, so the renaming seems as a better way than remove old list and add a new list (without -ng). Let's hope that gmane admins will be able to do the change.
http://article.gmane.org/gmane.linux.file-systems/49137 for more details about new URLs and addresses.
Thanks to Kay, Adrian, John and David.