If the Smarthome I/O Linc does not implement Peek and Poke commands EZSrve will not be able to write link records (create Scenes) in it using today’s function. You should still be able to establish the link between the I/O Linc and EZsrve using the Set button on the I/O Linc. With that link established the I/O Linc hardware will send Insteon Group commands to EZSrve which can then trigger a Macro(s).
This is all an assumption about how the I/O Linc will work, based on how other Smarthome 120V plugin devices work today. As you say, we will have to wait until someone gets one to see how it actually works.