I believe that this stuff is just a creative design. I had never heard of steampunk so i'm not sure but a lot of it looks like old victorian outfits with everything being very mechanical looking. Like people gluing gears to a microwave and calling it steampunk. lol but sierously... a lot of it looks really cool.
Steampunk does a lot of artistic derivatives of random stuff. They dressed up an XBox 360 to look like an old radiator and made a bunch of Star Wars figures look like antiques. Cool to look at, but not much practicality involved.
Steampunk is like a weird marriage among the Victorian era, science fiction and strange mechanical steam powered technology, but as if its futuristic with gears, leather and goggles everywhere. Think HG Wells "Time Machine", sorta, but some of it looks more like the wild west with guns and everything...
The new movie about Abe Lincoln Vampire Slayer, I believe< will be rather steampunkish. Whats that game with the nazi lookin monsteresque, somethin "wolf"... Castle Wolfenstein? I dunno, but some of that stuff looks almost like steam punk...