Age of Empires: Definitive Edition is a full on remake of the first Age of Empires game coming from Microsoft Studios, who are in partnership with another studio. As such, every asset is redone up to 4k resolution, a full orchestra has redone the soundtrack from scratch, pathfinding has been overhauled, you can now zoom out in-game to a ridiculous degree, and the UI has been completely modernized.
Regarding multiplayer, there will be Xbox Live Multiplayer, which will include lobbies, friends, and a web portal. Given that this the twentieth anniversary for the Age of Empires series, expect more AoE news to come throughout the year.
Age of Empires: Definitive Edition will be out later this year on PC. You can sign up for the multiplayer beta at ageofempires.com
If you want to know more about this and other announcements happening at E3 then be sure to check out our E3 2017 Coverage Hub.