This article states "In addition to the Northeast Regional, other routes that will be serviced by the new fleet include the Adirondack, Carolinian, Cascades, Downeaster, Empire Service, Ethan Allen Express, Keystone Service, Maple Leaf, New Haven/Springfield Service (Amtrak Hartford Line and Valley Flyer), Pennsylvanian, Vermonter and Virginia Services."
No surprises to me except for the Cascades, which is a geographic outlier and I had the impression Oregon and Washington might have had their own plans, but I guess the price was right. I think this is great news overall. Siemens Venture is a solid product from a manufacturer with a good reputation...if anyone can build a fleet that will stand up to the rigors of Amtrak service, it's them. I'm not sure about the semi-permanently coupled trainsets though, and I also feel that an opportunity is being missed to bilevel more trains which would have added capacity.