Even with magnetic connectivity, new Joy-Cons aren't the only anticipated Switch 2 accessory. Nintendo has submitted FCC documents featuring a device that resembles the Switch Pro Controller. Among other changes, the Switch 2 Pro Controller will offer a headphone port.
https://www.notebookcheck.net/Nintendo-Switch-2-Pro-Controller-pictured-with-headphone-jack-in-new-FCC-filing.991113.0.html
Wonder if it'll drift as good as the old one