You are probably right about the S260 not having an airbag. There is no mention of it in the press release. I am comparing with my US 260 which does have an airbag.
The first time I saw this steering wheel was about a month ago on another forum members 260 that was just delivered to Greece. He probably didn't have an airbag. However until that one, all other UK and European Exiges - with or without an airbag and the Momo wheel - got the exact same cover we have - like the one pictured on the Elise Club Racer.
So like you said, this may be a new thing with non air bag cars.
Those AD07 tires look different on the Elise Club Racer. Advan Neova? I have only had the AD08's - is this the same as standard Elise tires or are these different?