While not a perfect solution or improvement, this train within the past month or so was supposed to receive some Amfleet II long distance coaches. These are the type of coach used for the overnight services that provide greater seat pitch and both a foot and calf rest. It's still 2 & 2 seating, but it is much better than the corridor Amfleet coaches.

Note: You only get the better coach if you are going to Montreal. If you're riding a shorter distance, then you'll still see the regular corridor coaches, as Amtrak only has enough of the better coaches to put 2 on each train.

As for business class, my understanding remains that US Customs has shot that idea down. They like the idea of having a full cafe car to carry out their inspections.