- filesystem type, LABEL, UUID
The important detail is that libblkid gathers the info by seeking on whole-disk device according to partition offsets from partition table -- so /dev/sda[n] devices do not have to exist or you can use cfdisk for disk images (e.g. "cfdisk file.img").
- partition NAME, TYPE (hex/uuid and human readable name)
- mountpoint -- for mounted filesystem as well as for not mounted (then from /etc/fstab)
All you need is press 'x'.
The change is going to be available in util-linux v2.27 (May/Jun 2015). Thanks to Ondrej Oprala who has worked on this with me.