The UK CAA say that this has already started to be implemented in other EASA states. I don't know which states they are referring to but I imagine the take-up depends on which exam software provider each state uses. The German LBA have had extra questions which require written answers for some years.
At first sight this will have no effect on the content of questions and, provided the range of acceptable values for 'write in' answers is properly calculated it should have minimal/zero impact on anyone studying.