I think the vents close to the rounded corner can only be inlets. I can't see any logical way to use them as outlets. The rounded corner has to be a big centrifugal fan, so it needs a large intake both above and below across the entire corner. Otherwise it would go from an awesome flow-aligned design to a stupid "wtf, why u do dis" design.
The outlet needs to be coming from the heatsink, which would be mostly linear flow, which means it can only outputs from the bottom, or to the back, or both. (if the fan is in the front corner) Anything else would be very weird.
I could be completely wrong, but I see only three possible design:
1. Fan rotating counter-clockwise (viewed from the top when horizontal) and the heatsink is in the middle and blows towards the power supply at the other end (the bottom, when placed vertical).
2. Fan rotating clockwise and is blowing flat towards the back, which means the size is a bit wasted unless the fan is crazy big with a very wide HS.
3. Some fancy diagonal flow or "fanned out HS" using both of the above.
I choose #1 as the most likely, or #3 because sony is acting weird and this would match their attitude.
All of this applies whether they cool from both sides of the PCB or not, but I wouldn't be surprised they do, as we see connectors and buttons in the middle. It's looking very possible.
Sony always engineer the system first, and then try to put a thin shell on it and prefer the design to be as close as possible to the raw engineering result. This may look gaudy, but it has to be the natural result of engineering choices, whatever they are, with no artistic choices dictating the engineering. They would add the light line and a few tweaks here and there, dual color etc...