Actually, smart toilets have already existed in Japan something like a decade.
"Smart" is a vague term. Yes they tend to have toilets full of electronics, but those were not *connected*. Here the key is IoT!
Maybe recent japanese toilets are connected though, in which case I'd be curious to see that. Think of the implications, such as tracking when people use the toilets, for how long, and so on, and save that all on a centralized server.
But surely enough, if they aren't already, as I said, they will be.