Well, there it is.
As expected, everything's very tightly squeezed in there. I'm a little surprised that the cooling fins between the fan and vent take up so little space, but I suppose there's not a whole lot of cooling to be done. The total power output of the chip probably isn't more than 10-12W even in docked mode at full clocks. That J/L-shaped heatpipe should draw heat away from the SoC pretty effectively, though.
It's a bit annoying we don't have higher resolution photos, as the codes on the RAM modules would confirm all the memory specs (i.e. capacity, speed, bus width). We have leaked info on the first two, but it would be nice to get confirmation, and know whether we're looking at a 64 or 128 bit bus.
The use of a break-out board for the eMMC is really interesting. They wouldn't need this if they planned to just swap in higher-capacity eMMC modules at a later point, as the entire point of integrated flash solutions like eMMC is that it's all BGA-compatible (i.e. you can just solder on a higher capacity eMMC chip directly to the motherboard, without having to change any other components). It's possible that they're anticipating switching over to eUFS at some point instead, although that would mean they'd need to have support for both interfaces, and they could quadruple the capacity with eMMC before running into any problems (and they may well be a hardware redesign by that point). The other possibility is that they may want to use the same motherboard in a home console, and they've left themselves the option of using a SATA break out board for a HDD.
It'd be nice if they took the metal shield off the MicroSD card slot so we could see if it supports UHS-II. I very much doubt it does, but it would be good to get confirmation.
A decent photo of the small chip next to the RAM modules (which appears to be the USB-C controller) would be helpful, as if it's an off-the-shelf chip it could tell us some things about the capabilities of the port (e.g. if it can operate at 10Gb/s with DisplayPort alt mode disabled).
A photo of the alternate side of the motherboard would also be useful, as there may be some other interesting stuff on there.