rail system modular case, ducted zone cases, super novelty cases, metal fans, 3 prong heatpipes, gpu coolers
steve just roasts them for their naming.
the rail system is probably the most interesting thing for me. closest thing to a lego case. the hardest part would be side panels if they allow you to cut custom length rails, though a 3rd party system or something like tap plastics could spring up.
the 360 clear case is kind of a peek into our future, but the trend of lcd displays all over the place will probably overtake the all glass fad.