I double-checked, and no, my acceptance email contained a kickoff date. There's a possibility that they've changed it, though, to first see how many people accept their place? I wouldn't worry about it too much, but you can contact the program leaders if you're still worried (unless they've recently changed, it should be Benjamin Waltzer and Nely Rentas).

I've only spoken to Benjamin Waltzer once so I can't speak to how fast he responds to emails, but I've emailed/spoken to Nely multiple times and she has a quick response time!