Yes, that's true. The letter is a UK CAA 'notice in advance of an information notice' which says that, although they planned just to introduce 'write in' answers for calculation questions they have changed their mind and will introduce the full suite as of August in some exams. They say there will be a video on their website shortly and the title infers there is an Information Notice in draft somewhere about to be formally issued.
Having read the letter several times the inference is that they will start by putting existing questions into the new format, so, for instance, questions like "Which of the following statements is true?" will change from (a) I, II, IV, VI and VII (b) etc.. to actually selecting the correct statements.
We have the programmers working on the new formats for bgsonline and will be doing likewise so that you get some practice. I imagine aviationexam will be doing the same.