According to Ming-Chi Kuo, Touch ID will not make an appearance in the iPhone 15 or iPhone 16 series in any form. On the contrary, Apple will continue to develop its Face ID hardware, which may reach under-display status by the iPhone 15 Pro series anyway.
https://www.notebookcheck.net/Ming-Chi-Kuo-rules-out-the-return-of-Touch-ID-for-flagship-Apple-iPhones.610907.0.html