All of this is speculation at best. CTC does invite many of their partners and would surely make a bigger thing of this, though I'd like to be proven wrong!
BA has attended the Pilot Careers shows regardless of FPP. Keeping the interest going I guess.
Also the photo I've seen for the event is of BA Cityflyer aircraft. Which hires totally separately to mainline, but through CTC (though most cadet pilots come from FTE)
All will be revealed... or not