Really confused about the USMLE

So I keep hearing that the USMLE is changing and I'm not sure what this means. Has the exam changed in 2019 so far? My friends who are preparing for Step 1 said that the NBMEs or UWorld are not an accurate predictor anymore since they've replaced 5 out of the 6 current NBMEs...can anyone comment on this and what it means for future test-takers? Thanks in advance!
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Pre-Medical - MD Source Type: forums