Although its focus is on local services, the Network Rail
East of Leeds study contains some interesting detail about the future Transpennine services, as shown here:
Taking the six Transpennine services shown in the study and applying the proposed journey times post-upgrade gives the following details:
TP01 - Liverpool- Newcastle - 2h45: 7 diagrams
TP02 - Man Air - Newcastle - 2h40: 7 diagrams
TP03 - Man Air - Saltburn - 3h20: 8 diagrams
TP04 - Liverpool - Scarborough - 2h30: 6 diagrams
TP05 - Man Picc - Hull - 1h50: 5 diagrams
TP06 - Man Picc - Hull- 1h50: 5 diagrams
I presume that TP01 and TP02 will continue to be served by the 19 802s (which could be replaced with electric-only), then TP03-TP06 served by the 29 newly ordered trains. So the diagrams are covered with some trains to spare.
My understanding is that Dewsbury and Stalybridge are only going to be served by the 'semi-fast' trains which I presume are TP05 and TP06, so a bit of a mystery why 200m platforms are needed. I guess it future-proofs things.
Still, with 6 x 300-seat trains per hour we're getting 1800 seats per hour which must be the highest provision for an intercity line not serving London, and with room to expand in the future.