A more modern period would fit the pattern so far. (Orlando’s list of dates starts aoe1 pretty much after the bronze age, I’d move the starting date maybe a few tens of thousands of years back, but that’s the one nitpick I have.) If they go that route I would expect the game going from maybe just post-Napoleon (Maybe with the US civil war as a learn to play campaign?) to WW2.
That period can be made to fit the series formula. Age 1 has muskets, horses for scouting, possibly sailing ships. Age 2 has rifles (revolvers, shotguns), steam ships, possibly machine guns, armored cars and/or scout planes if they feel like that would be best mechanically. Age 3 brings out all the remaining main technologies, fighters, bombers, tanks etc and age 4 is the bigger and better age. It would undoubtedly play as an Age of Empires game, and it would still fall within the domain of historical wars, in the sense that the amount of people that will ever play the game that have also fought in the second world war will be rather limited, given the time gap of over 70 years and counting.
Is that the way they’re going? I have no clue. None at all. Literally. That seems to have been half the point of the announcement trailer, not giving people a clue. The a new age line seems to hint at going forward, but without any images that support that sentence the link is rather weak. I wouldn’t even be surprised if the time period isn’t nailed down yet. They’re probably working with a certain period in mind, but in this stage (or at least the stage they were in when the trailer was made) they will be focusing on core mechanics rather than specific units and such, and not announcing the period means having at least the theoretical option to switch or slightly tune their periods if that improves the game that follows from the mechanics. Another good reason for not giving anything away yet is reserving the ability to create hype by releasing that information later. I know I will be hyped when the period is announced, pretty much regardless of which period it end up as.
And to counter myself a bit further: keep in mind that there were two years between the release of the first two games, and six years between 2 and 3, which was cut right down the middle if you include aom. It’s been 12 years and counting since game 3, any patterns established are solidly out of the window by now. (Aoeo was released in the middle of those 12 years but it broke the pattern itself, so if anything it counts against the idea of progressing time periods.)
I honestly don’t know what I’m hoping for on this one. I always, coupled to the mechanics of an aoe game, liked the setting of game 1 best. But there are so many cool historical periods, and even if they don’t match the age progression idea quite as well they can all be amazing games. In short at this point I’m just plain curious.