Honestly not sure about what grading is for the new curriculum. For me it was H/P/F and internal ranking. Clinical years grades are weighted more heavily for determining class rank (a good thing). For residency programs, in the dean's letter it says if you are top 10%, top 1/3, middle 1/3, bottom 1/3. TBH grades don't matter for pre-clinical years at all, they matter a lot more for clinical years (you want honors in as many things as possible and especially in specialties you are going into). But grades are almost meaningless compared to Step1. Jeff's Step1 is usually a little higher than the national average and they give a good amount of study time.
The best part of the new curriculum is starting clinical rotations at the end of 2nd year. There is no need for 2 years pre-clinical and now you will have more time to explore specialties.