Another new very interesting one with RPI form-factor (shipping 31st of July):
Doesn’t have SATA, but USB3 which should be good enough for most needs. Also has a faster CPU and up to 4GB ram, which I think is a BIG plus if you want to run some additional apps and services on it. Last but not least, I think Rockchip SOCs have generally much better main-line Kernel support, but I can’t say for this exact very new model (ok checked: no full mainline support yet, but the Rockchip in-house kernel is at least 4.4lts based and initial support for the SOC is in kernel 4.12). No wifi though, but it might be better to connect it to a dedicated OpenWRT router via the GbE port anyways.
Edit: I think we found a winner for now