I picked up the Skitarii Codex today. Its a really good book, lots of illustrations and fluff. FOC wise its another "special" one, though not as headache causing as some. You have no HQ, min 2 troops, optional 6 more troops, 4 each of elite and heavy support, and 2 fast attack.
Any Alpha can be a Warlord, though if its a Skitarii one you get a D6 roll on the traits table. The Sicarians only have a D3 roll. Also theres a relic that is Nikola Tesla's skull. Yep.