PFRDA released official regulations on 19th March 2025 regarding the OPS operationalization w.e.f. 1.4.2025. Those who want to opt for the Unified Pension Scheme (UPS) may do so within the time stipulated.
Access the official gazette here: https://www.pfrda.org.in/WriteReadData/Links/UPS_compressed2710ffb6-c585-4663-adf7-476ca9cb9582.pdf