I believe GTR are planning to hang on to a small number for peak services to Peterborough - at least, that was the plan when the franchise began - see this factsheet: http://www.thameslinkrailway.com/download/10128.3/route-factsheet-2-great-northern-outer-services/
I wouldn't be surprised if some of them still end up at GWR, despite the recent announcement of new trains.
I wouldn't be surprised if some of them still end up at GWR, despite the recent announcement of new trains.