Recently Blizz released a video preview of their new map Eichenwalde, a Castle themed map set to be released into Overwatch some time next month and is designed as an Assault and Escort Type Map! The map was announced at gamescom 2016, and is set in an abandoned village on the outskirts of Stuttgart, Germany.
Story wise, the location is part of the most famous battles during the Omnic Crisis, it was here that the leader of the Crusaders, Balderich von Adler, and a handful of his best soldiers made a last stand against an advancing automaton army. Outnumbered and outgunned, they were ultimately slain during the resulting combat. However, thanks to their valiant efforts, the German military was able to push back the omnic offensive and win the fight. This is possibly the fight we see in Bastions Short Cinematic introduction released a few weeks ago.
The map is going to be a rich source so story, as from the video shows the scattered remains of many Bastion, from a huge fight.