Filming on Season 2 of the Apple TV+ series Dickinson, which stars Hailee Steinfeld as a young Emily Dickinson, has been underway for a while now with details being kept mostly under wraps. But today is a "mark your calendars," momentuous kind of day because we learned something new: Iron Fist alum Finn Jones is joining the Dickinson gang. That's right: Jones is moving on from the Netflix/Marvel TV series (which shuttered in 2018) and has boarded Dickinson. He was included in a cast photo taken by Dickinson showrunner Alena Smith and posted to her Twitter account on …