i think a cool idea for DLC would be a map/level/mission editor in which we could create our own missions and share online. not only would this extend replayability 10fold, it would create interesting and limitless scenarios. if we could build levels and set guard paths, objectives, and targets, and be able to upload them to a server to share with everyone that would be awesome

Not just a level editor, but mod tools. As Bethesda already has Steam Workshop integrated in Skyrim, they could also get it in Dishonored, which would make modding even easier.

yeah that would be great for pc, which im sure people will be expanding upon in the modding community. but i unfortunately dont have a new computer so i play my games on console. even when my pc was considered high end i usually just played starcraft, diablo or counter strike and the rest on my consoles. but yeah that would be great for pc. if console had a level editor/map creator like halo forge or far cry's map editor... it would be a great and easy tool for the devs to give us and wecan create our own content.