The National Emergency Response Information System (NERIS) is being developed now, and is intended to roll out to early adopters in 2024, and roll out to more departments in 2025.
No, continue to file your NFIRS. NFIRS is intended to be archived soon, however the NERIS team have stated that fire departments can continue to use NFIRS until they have migrated to NERIS.
If you want to go in depth, you can find more information on NERIS at both here USFA website, and on the FRSI website.