It has become official that the map Suez will be reworked as to feature five flags instead of just three as well as being enlarged.
https://www.battlefield.com/news/article/battlefield-1-the-road-ahead
Personally, I really hope that the artillery base and trench system sections will be the two new flags, as I feel that will be much more interesting than just adding two flags at the sides of the map. Those routes should still remain available for flanking and we need more trenches in the Conquest mode of this game anyways.