[binomialxenon]

Yeah, I'd be happy with a board that's identical to the RPi3 but with eMMC rather than SD. Not only is SD less than reliable, it's slow.

[l1k]

The Raspberry Pi Compute Module 3 is just that, the SoC of the RPi3 with 1 GByte memory and 4 GByte eMMC on a SO-DIMM module. You need a baseboard though to plug it in. Either the Eval Board offered by the Foundation, or a Revolution Pi if you aim for industrial use, or some other baseboard.

[Technetium_Hat]

I had no idea that the slot it used was literally just a SODIMM- I thought it was some other strange slot. That is really interesting.