PIP review.

I had a text from the DWP today, saying that my PIP was due for review and that they were sending me a form to fill in within the next few days. My question is this - am I right in thinking that the welfare reforms don't start until November next year,and that the necessity to be awarded 4 points on at least one of the daily living descriptors starts then? I'm worrying because I was only awarded 2 points in several of the categories when I had my last review 5 years ago. And when November 2026 comes,I won't have my PIP reduced if I don't get awarded a 4 points in one of the descriptors this time?