Every following CA game moves from the Ancient times to Nowadays. Rome, Middle ages, 18th century Empire, Shogun (yes, one goose step back but then three steps ahead, welcome 19th century!). It seems that the next game would be late 19th century Europe with Americas, India, Africa, Pacific Region. And then there would be WW1 official addon.

There are very interesting ideas already introduced in S2FoS, which wouldn't be abandoned because they are very good and they eat lots of time and human resources to be made just for one addon. Trench war, hiding in buildings - possible since Empire. Railways, iron ships, machine guns - sins S2FoS. Come on, pilla throwing and ballista shooting seems childish from the technical (in-game realization) point of view. What might replace this interesting features in Rome 2?

Plus RTW is not outdated yet. Why would they make Rome 2?