Looks like 2-3 people are working on personal DIY projects to adapt a thinkpad keyboard. I don’t know if any plan to include the touchpad.
Thinkpad keyboard mod (super early stages)!
Haven’t run across any sign that Framework or a 3rd party plans to create a touchpad with button for sale.
I think there is a better chance that someone will do it for the FW16. Since it wouldn’t require an entire replacement input cover there, like it would on the FW13.