The following units are on the "Unrepresented Units" list but do currently have painted-up miniatures:
ilKhanate, Clan Sea Fox
Eighth Avalon Hussars, Federated Suns (also, the Eighth's page incorrectly refers to it as the Eleventh)
Dahar DMM, Federated Suns
Griffin's Pride, Mercenaries
XII Hastati Sentinels, Republic of the Sphere