already enacted, vote went through in July. However the "come to force" of the earliest part of the regulation is 2025 and the replaceable battery mandate come to force date is 2027. However I would assume stuff starts going with replaceable battery 2025-2026, since by 2027 it's illegal to not have that for on sale item. So one would transition year or two early to have ones retail and supply chains empty of the old non-replaceable stuff to avoid having unsold stock or get hit with punishment for being caught selling non regulation items*. So you want the replaceable battery products designed and in production before 2027.

Also one key I would point out, that is often left out. It doesn't only cover phones. It covers pretty much all battery powered electronics. SO lots of those other small electronic gadget with built in Li-ions will start sprouting battery covers or possibly moving back to their old power of choice, banks of AAs. Since those are inherently replaceable. Well plus non-recycleables aren't covered by the regulation. However also the maker can argue their green credibility with "well customer can put rechargeable AAs in it. Then it's a replaceable battery product."

* Well in reality one's retail partners would refuse to accept the stuff for sale, since upon it being on sale at their shelf it's now their ass on the firing line by regulators.