So looked at the rules for the Skitarii in this weeks White Dwarf... nice. Bit better than guard stat line wise, awesome new weapons, some kind of orders system (theres a special rule which is left unexplained and something about one of the special issue war gear for the Alpha of the unit giving plus 1 leadership for rolls for that thing), Alpha has 2 wounds and they are Relentless. Nice. Nice.
Also they are Troops, with the two versions of that walker acting as Fast Attack and Heavy Support. Also theres mentions of tanks when they show the new, huge mail order transfer sheet. Hope this means they can use any tank from the guard/space marines! (they should, really)
Preordered two boxes. Gonna make them as one each of the Skitarii troop choices, 1 Rangers 1 Vanguard.