The zimablade looks interesting: 2 sata on board and a full pci-e slot, Intel quad cpu, fanless.
When will we get a Pi for storage that doesn't need to use usb?
Edit: i took a look at the zimablade in spite of the atrocious web 5.0 site with silly animations getting in the way of getting to the specs.
Nice. 2 x gigabit ethernet when?
Yes. It's all I could get at the time. I chose zfs to allow me to move disks to true sata over pci when I can.
The 5 appears to allow a pci bridge to be used. It's possibly my next move, I've had the radxa hat for a couple of years now.
As for being underpowered, again it depends what you are doing with them. For my NAS (basically long-term storage of stuff I don't access much and tiemmachine backups) there would be plenty of CPU, the biggest problem would be memory.
*edit* Just to be clear, the Pi has some massive drawbacks as a NAS at present because of it's significant lack of disk IO, but there's nothing inherent in it's form factor that makes it a bad NAS. If I could have plugged 2+ HDs into one in a performant way I'd likely have done that rather than the Dell Optiplex shenanigans.
Off the shelf options tend to have awful software, pis have good power consumption, and as of the 5 is it really underpowered?