They look excellent - no surprise it is Hitachi with their strong bimode offerings. Livery with the absence of yellow makes a nice change!
The order for the further 25 I see is to be finalised soon as well - I assume that it's bets on that'll be Hitachi as well.
I think 19 was the most they could get as an add-on to the existing order for GWR and Hull Trains. If that is the case the others will have to be done as a new order, which decreases the chance of them being Hitachi trains.