Of course I know. He's frickin' announced it already. If she gets the seat, he's absolutely running for it in two years. He's definitely not running against Schumer for his seat (which will also be up for re-election in two years).
He hasn't taken a position (that I know of) on any other candidate.
Even Dems in the state say he'd be a fool not to run against her as it would be his best chance to make it.
I just hope he gets an early start and doesn’t face any serious primary challenges, so that we can all focus on sending Lady Caroline home in 2 years. Or at least for some remedial speech lessons.