I've heard about it but it keeps getting delayed, so I'd kind of forgotten about it.
But it seems it's finally happening - they'll have to be some notice to allow people with travel already booked to apply and for it to be processed, including allowing for any teething problems. It says in the link the 'first half of 2025' which could be as late as the end of June although I see upthread 5 May has been suggested.
So maybe the intention is after the Easter peak but before people start going on summer holidays?
I'm sure publicity will be widespread including social media, news sites and multiple prompts when booking flights but it's also likely we'll still get the 'sad face' reports and posts from people claiming they'd never heard of the scheme and are now stuck because they fly tomorrow or have been turned away at the airport.