The chances seem good that some upgrades will be possible to make as a third party too, maybe not a new motherboard - though I wouldn’t be that surprised to see

The chances seem good that some upgrades will be possible to make as a third party too, maybe not a new motherboard - though I wouldn’t be that surprised to see somewhat put an ARM SoC in there - but the ports are based on USB-C and it’s definitely reasonable for someone to design their own.