I dunno about you guys, but I think there are some major potential character revelations for this guy.
First off, let's talk about his possible relation with the Sato family. I think it's a bit of a long shot to assume he has any relation with the Sato family despite his current position as a construction worker's nephew and the fact that his name is SATOru. This may seem like a major connecting thread to you guys but I think Bryke is just messing with us on this one xD I mean think about it, his full name would be Satoru Sato... O.o that just seems rather, unlikely. His current position however, might indicate something. But I think I recall at one point Hiroshi saying that his family was poor. And Satoru with all of his technology advancements and whatnot would obviously be making alot of money. So, unless Satoru's factory gets destroyed somehow maybe by that monster that Aang envisioned, or if Aang makes him leave on the grounds that he defiled his sacred land (which I see as highly unlikely after watching that episode about the northern air temple again) I can't imagine him going broke any time soon. But if he does, then him having any relation with the Sato family would still be pretty vague, ya know... "Satoru Sato".
Now let's talk about Toph, Satoru is a HUGE fanboy of Toph. He deeply admires her for inventing metal bending and even agreed to sponser her a new metal bending school in exchange for her services around the factory. This would mean that they would be spending alot of time together and it may very likely reside in marriage too. I don't mean to sound hasty just yet, especially considering how these comics are still in the process of being thrown out there, but keep in mind Toph never really had a real love interest. And I think the only reason for her having a crush on Sokka in the show was a means for the devs to show a more feminine side to her, I think even the devs show that they don't want Toph and Sokka to be together, they even put a restriction on it in LoK. Making it so Lin (Toph's daughter) and Tenzin (Aang and Katara's son) were once in love. Since we already know that Katara and Sokka are brother and sister, let's assume that Sokka and Toph did get married... Lin and Tenzin would be cousins. This pretty much confirms that Toph and Sokka will never happen. So sorry to all you Tokka lovers, her having a new character as a love interest may not seem like a big stretch to me. So I think Satoru being Lin's father is very possible!
With that being said, I can't wait untill the rift part 2 comes out! I'm excited to see what happens!