New article confirms it is George Groves.

Groves set to leave Warren for Hearn | BoxRecNews

I am massively impressed with the work Eddie Hearn has done recently. In the last 3 years they've kept Prizefighter going, signed Froch, Barker, Frampton, Brook, Bellew, McCloskey, Rees etc, and put on some quality domestic fights such as Crolla-Matthews. Every card is full of decent fights. I'm not surprised Sky decided to sign an exclusive deal with Hearn and walk away from other promoters.