I'm an Iron Kingdoms fan myself, and Privateer Press puts a lot of labor and love into their work. I'm certain that it will be quality material.
However, their forte seems to be miniature wargames. Iron Kingdoms d20 was cool and neat, but they tried too hard to shoehorn some things into the D&D system. I am wondering how they're going to incorporate firearms; will they be common and prevalent (like in the miniatures game), or rare and expensive with swords and crossbows in the majority?