Realistically I think this is the best chance we've had in 10 years for it to be an ancient game.
If Norway is not on the map it probably wont go as far as china at start, but will do with DLCs. The Imperium Universalis MOD has shown the way offering various start dates going back into the Ancient Greek era (500 BC?? ). If they do that, add CK2 style Character management, Vicky style pops, in depth political mechanics (senate faction management etc), and a greater focus on the army, then it could be Paradox's best title.
However absence of evidence is not proof, so the fact they haven't denied it was Rome doesn't mean it is happening. We could all be very disappointed.