Looks promising, i am looking forward to get a more powerful sbc and i dont need any gpios or additional connectors.
A unused single serial connector would be nice. So that a external microcontroller can be directly connected without usb.
You mentioned 2 serial headers is it possible to use one for the kernel debug output, so that the otherone is free for custom applications after boot?
Is everything working fine like USB3.0, WIFI, eMMC and GBit Lan?