While the original Switch's Joy-Con and Pro Controller accessory are both compatible with the Switch 2, Nintendo producer Kouichi Kawamoto says in a blog post posted after the Nin

When moving from one generation of consoles to another, it’s not always guaranteed that old accessories will work with the new system. So, do old Joy-Con, Pro Controllers, and other accessories

Nintendo has taken the wraps off a Pro Controller to go along with the newly detailed Switch 2. It’s been upgraded with two new ‘GL’ and ‘GR’ buttons on the rear grips which can be used to remap other controls, a ‘C’ button to enable voice and video chats, and a 3.5mm audio jack along the bottom.