COMLEX vs USMLE post-merger

As a pre-med student applying to both DO and MD programs, I am trying my best to educate myself about the residency merger. These might be dumb questions, but I have experienced trouble researching them. Will DO schools adjust their curriculum to focus more on USMLE prep? What is the purpose of keeping the COMLEX, and what incentive is there to study for this post-merger?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums