Booking is now available. Given the number of new Viewliner II sleepers being delivered, Amtrak has quietly accepted delivery of 12 of the 25 new Viewliner II sleepers in order since April 2020 with 16 in total been delivered so far, I have to assume this will be permanent. There are multiple differences between the Viewliner I and Viewliner II, most notable that roommettes no longer have the weird sink/toilet combination. Also, a notable difference is the speed rating. Viewliner I sleepers are rated only for 110 mph while the Viewliner II sleepers, baggage, baggage/dorm, and dining cars are rated for 125 mph. So, given the current schedule of trains 65, 66, and 67 being unchanged timing wise, I believe it is very likely Viewliner II's will be regularly offered on these trains.