12 of the new trains, specifically stated to be for WCML services, will be pure EMUs. Unless you know different, only one non-industry online news site has reported 125mph capable cascaded trains from other areas of the country being received by the Transpennine franchise.
It's also been reported this week that the EMU's were being split from the main TPE order - so, time will tell exactly what's been going off in dialogue between First and DfT since Dec 2015.
To repeat myself, 225s do not become available until mid 2019 at the earliest.
That was the case, however plans can change in the meantime, just in the same way that 387's have had to be ordered to help out before the deal on the 700's was agreed and the recent rumours of Hitachi offering more bi-modes (presumably at a nice profit) on the WCML to help ease the pain of electrification delay.
Yes, exactly as I said. One non-industry news site, whom I suspect it more likely to have gotten their wires crossed on this matter.
Possibly, although to be fair, it's been reported in a number of rags in the North of England, although these could be owned by the same newsgroup as the wording is the same.