It had been in the works for a while, but now it has formally been adopted. From the article:
The regulation provides that by 2027 portable batteries incorporated into appliances should be removable and replaceable by the end-user, leaving sufficient time for operators to adapt the design of their products to this requirement.
It depends on how “friendly” they decide it has to be to replace the battery.
The battery in my iPhone 13 Pro is certainly end-user replaceable, but it’s significantly more difficult than it was for me to pop the battery out of my Galaxy S2 and put a new one in.