Straight from the new book! All are spelled out, but the ul'jaya, but it is most likely Illiir, and previous data supports that.
ul'wei - altheres, paranoid about privacy, cloak themselves, get along well with val'abebi
ul'Hsin- cadic, can make it so others can see in them what they like (bloodline ability to alter appearance?)
ul'Lo - unknown, wiped out by ul'zheng
ul'zheng - hurrian
ul'Rankin - Yarris
ul'shi - larissa, aspect of gluttony, very large muscular family
ul'jaya- illiir?
ul'tang - nier
Also this note on the val'Tai (not Ul),
Quote:
Centuries ago, the Goshin were a vassal family to the val’Tai, one of the ancient Sarishan lineages that were banished to the Infernal Realms as a dying command of an Imperator. Upon the founding of the Khitani Empire, the Sleeping Emperor commanded granted the Goshin the val’Tai’s former lands and bid them to learn the secrets of their ancient masters to better serve the empire.