iOS 16 includes code-level references to what appears to be a new and unreleased version of the Siri Remote for the Apple TV.
The first two betas of iOS 16 include strings for “SiriRemote4” and “WirelessRemoteFirmware.4” that do not correspond with any existing Siri Remote, according to Aaronp613, a contributor at AppleDB, an online database of Apple software and devices.
Aaron said the original Siri Remote is identified as “SiriRemote,” while a revised version of that remote with a white circle around the “Menu” button is “SiriRemote2,” and the silver Siri Remote released last year is “SiriRemote3.” This leads to the possibility that “SiriRemote4” is an upcoming remote for the Apple TV.