We do know how many brand new carriages they'll be.
We don't exactly know how many will be for non-electrified lines at present.
I have also observed in some instances the interactive map:
http://maps.dft.gov.uk/northern/index.html says brand new e.g. brand new EMUs for Leeds to Skipton/Ilkley and in others it says new e.g. new EMUs for Manchester Airport to Blackpool. It might be that's unintentional but then it might be intentional we don't know for certain.
One thing we do know is the 'Northern Connect' services in the North East will get refurbished 158s, so if 'new' on other routes means refurbished DMUs then why not say so?
For Leeds to Doncaster it actually says
That could allow either cascaded 333s to go on to Leeds-Doncaster or brand new EMUs. Maybe that's partly why nothing has been said about rolling stock for Manchester to Crewe/Stoke, they've not made a final decision about whether the 333s will remain in Yorkshire or not.