Yeah, there's a vent all along the front edge by the 3.5" mounts, which would allow air to exhaust for a positive pressure case, or be intake for negative pressure, but it looks like any airflow past the drives will have to basically ooze around the mobo and/or through those mounting slots where the drive cages normally go, so there's wouldn't be a lot. But I think there'd be enough slow airflow to keep it from being stagnant, good enough for modern cool-running drives like WD Reds or similar. You wouldn't want to put anything that runs hot back there, but none of us will be using Velociraptors anyway. Especially since there isn't any room to suspend them, either. Really, I think this kind of design reflects a new option for SSD based systems, with spinning platters kind of deprecated but still usable as long as you don't push your luck, instead of their management being a big focus of the case.
I also noticed that soft-mounting the front fans might be a bit tricky, with those fan mounting slots
instead of holes, the pretty much flush mounted dust cover, and no real access to the far inside edges of the fans. Rubber mounts won't grab the slots very well so the fans may tend to slide down and touch each other. Gelid style
fan mounts that go on the fan first and then stick out of the case would interfere with the dust cover, and flat-top Noctua style
mounts that go in from the outside will be hard to pull through the fan frames. I guess those extra-long ones
would work, but I've had a lot of trouble with that kind tending to snap when pulled through. But maybe those, with extra mounts inserted between the fans to keep them apart? Hmm.