Well, an unexpected bummer.

From what I can see using expedia, ANA will be using their "3-class" 787 (Business, Premium Econ, and Econ) with 3x3x3 seating in economy.
Seat guru has the pitch at 31", which is what their 777 is as well. So same leg room, more narrow seat.
I should have booked the later 777. 1.5 hour earlier arrival is not going to be worth it.

For some, it will be a nice as Business Class is staggered lie-flat.

I really wish there was a way to book the ANA Premium Economy seats on UA.com.