A "definite" start date of October 12th, 2025 (with a six-month phased introduction) has been announced by the EU for the long-awaited roll out of Europe's big border change, known as EES which stands for Entry/Exit system . As a reminder EES will involved enhanced biometric passport checks for most non-EU travellers entering the EU/Schengen area. They will also digitise the enforcement of the 90-day rule to replace manual passport stamping.
Many recent travellers have already experienced part of the new EES system, if, for example, they have passed through the automatic passport readers at Rome's Fiumicino airport. The complete system will require initial registration and fingerprinting and the data will be online for future EU visits.
Also announced was a rough start date 'towards the end of 2026' for ETIAS - the visa waiver for non-EU travellers from countries including the USA & UK will need when visiting EU/ Schengen countries in future.
It's always better to use official sources for info (as opposed to random fellow travellers) so here is an official website for more info: https://travel-europe.europa.eu/en/ees