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.
I am guessing it will look like the fairphone(they let you remove the cover without tools), so like a standard looking phone but without the glue and easier to remove the cover, not as easy as before smartphones tho but doable.