More of a curiosity than an issue for me.
On an Ubuntu x64 10.04.x machine, the blkid command seems to be reading stale information about file systems. The problem partition is from a USB3 connected drive.

$ blkid
/dev/sdh5: LABEL="mybook" UUID="F21E9E5F1E9E1D23" TYPE="ntfs"
But I did a mkfs.ext4 on that partition a few weeks ago.
$ df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sdh5            965291104 540102124 376155048  59% /Data/mybook
$ grep mybook /etc/fstab 
UUID=ab2dbf42-2408-4316-9e62-6ad18ae6013f       /Data/mybook    ext4    defaults        0       2
and mount shows the truth:
$ mount
/dev/sdh5 on /Data/mybook type ext4 (rw)
So there are 3 places that show it correctly as ext4, but blkid doesn't. Is this the expected behavior?