The SAT Writing Test has remained pretty constant. The same distribution of skills asked in the same ways. This consistency is in part why the Writing Test is the easiest to move scores!
There is one new skill that is emerging: Main Idea Questions!
The March 2021 test had FOUR! By comparison the October 2020 Test had 1! And of all the SAT & PSAT that we can get our hands on (in the books as well as question and answer services) - there have only been 14 of these questions asked.