Looks like there were a couple of errors I didn't catch.
I could take another look at the d10 hit die for the class. I think in the original design notes it's 1d8 hit die. Skills could probably be increased as suggested to 4 + Int mod./level.
Air Damage...That should read as bludgeoning. We were tinkering with Air damage as being half bludgeoning, half electricity, but it looks like that didn't make it into the layout. Oops.
Finally, the mention of the air domain. Bonus Spells from the cleric's air domain are added to the windblade's spell list as per her skybond power. These should be applied exactly how a cleric of the windblades level receives her domain spells.
Any chance of a change to the sword of winds duration? It seems like an iconic ability of the class but is extremely limited in duration (even though you add two modifiers to the abilities duration.) Something like 1/2 level plus xxxx modifier. It would make the ability more accessible while still maintaining balance. Also the addition of the different elemental damage bonuses seems a bit clunky. Why not simply allow them to choose another elemental damage type every 4 levels. This way they could simply change their weapon of winds elemental damage type based on which types of elemental damage they have previously chosen.
You can disregard my previous post as my tablet is a bit nutty at times and failed to load the entirety of the thread