I'm a returning player (last played a few years ago on kingdoms, prior to that on travian 3.0/3.5/4).
I moved over to kingdoms because I just think the presentation of the core mechanics is a little bit sharper. That and access via mobile is increasingly more important the busier I get.
Looking over at Travian legends nowadays it seems (to me at least) like that platform has more going on (introducing new tribes, video/dev blogs etc.).
Is there a road map that's been shared previously for the development and expansion of kingdoms? Or is it simply meant to be an spin off of legends based on a snapshot of the game at that time?