Factions will be six, although they will have expansion packs, that will reach further into the factions we see in RTW:BI. It"s kinda lame only to be able to play with Greeks and Gauls for now.
I've even wanted to try my luck modding there by adding crew members myself into siege weapons. Sea battles look very unfinished too, I did wrong by expecting them done.
Pathfinding has gone under further development in the last three releases. Although I never tested it myself before Cerberus.
After all it's still alpha :thumbs up: