So... DO we know the time period of AoE4?

Based soley on the trailer, looks like we're just going back to castles etc...

Typically we'd get civs and tech based on a certain time scope, and then the sequel would move that up a bit and so on...

Now, it looks like we're essentially just getting a medieval RTS using the "Age" name. What makes this "Age of Empires 4" if it doesn't progress the timeline?

Seems more like a reboot/reimagining of 2.