rad!! yeah I was kind of thinking of something between a dev board and a system on module (SOM) with: FPGA, a microcontroller (for i2c config), RAM, video in and out, USB for firmware/gateware updates, and a ton of header pins on it. That would allow anyone to add another PCB with whatever user IO and connectors they desire then sell it or remix it into whatever application they want.
does someone want to start a google doc or git for potential specs?
@BastienL you are totally right about needing the i2c for config.
@cyberboy666 in quantities of 100 or so the ECP5 LFE5U12 is only about $7.50 a piece, with the ice40 at about $6.50. The downsides are that it only comes in BGA packages and requires more power (still a low power device). I think for HD the faster fabric will be necessary and you will definitely need those multipliers for any filtering application.