Juli Clover, MacRumors:

The Combo Touch for the 11-inch iPad Air is $200, while the Combo Touch for the 13-inch model is $230. The iPad Pro versions are priced at $230 and $260, respectively, for the 11-inch and 13-inch models. The keyboards can be purchased from the Logitech website.

Apple itself charges more for everything with the iPad Pro models — e.g. it costs $200 to add cellular to an iPad Pro, but only $150 to add cellular to other iPads — but I don’t think there’s any difference between Logitech’s Air and Pro models other than the depth of the case.

Update: The Combo Touch cases for the new iPad Pro models are not yet available to order.