Question regarding the Aero Train Sets for NEC

I know Amtrak is having Siemens introduce the Aero trainsets to replace the Amfleet coaches. These sets include locomotives for with, electric and battery options. This is great for areas connected to the Northeast corridor but lack electrification (PA, CT, and VA). But what about the fully electrified route from Boston to DC? I assume the ACS-64s are remaining in service. Are they just going to be pulling Aero coaches like they do right now with the Amfleets (and no loco or cab unit on the back)? Thank you!