As you can see in the gallery below, lifting the side panel also reveals redesigned internal storage bays. Two compartments, one atop the other, each contain a pair of hard drives laid on their side and fastened with two removable brackets (which, thankfully, still have rubber grommets to isolate hard-drive vibration). A 2.5" solid-state drive can also be strapped to the top hard-drive compartment, facing the motherboard.
The Antec One Hundred on the other hand has a MSRP of $60. It has an all-black design and provided only the necessities, although USB 3.0 seems to be lacking.
The One Hundred takes after the popular Three Hundred, offering a no-frills design with a good number of enthusiast amenities. This particular model has a cut-out in the motherboard backplate for the CPU socket, some cable-routing holes, holes that can be punched out for liquid-cooling pipes, and an upside-down layout that places the PSU at the bottom. I believe Antec will be shipping the One Hundred with dual 120-mm fans (one at the top and one at the rear).
More pictures can be viewed at The Tech Report.