First of all, there's lots of people saying the new test is easier, but take that with a grain of salt. All of those people probably spent a considerable amount studying between the two tests so hopefully they had an easier time. Objectively speaking, I found the new mcat AT LEAST as hard as the old one if not harder ( and I did better on the new one).
Chem/phys: everyone says that physics gets deemphasized on the new test and it's true that less topics are officially required, but this section wrecked my life! The AAMC FL makes it seem like it's a biochem test with a subtle undertone of applied physical sciences. That's a lie! I did better on this section on the old mcat.
CARS: seems like they forgot how to spell "verbal reasoning" because this is the same thing.
Biology: felt like the old biology section honestly. Just add a little biochem and it's the same.
Psych: welcome to the "Applied Verbal Reasoning" section. Learn your theories, learn your terms, and get ready to be able to make assumptions about them. Sociology is harder than you'd think and it feels like whoever writes this stuff was very excited to prove it.
One advantage is that you do have more time per question. You also have more convoluted passages so that could even out. Overall, it helped me. Depending on the student, the incorporation of ochem into physical science and deemphasis of ochem in biology could help or hurt you.