I normally don't care too much about co-op, except when it can really enhance a game. Like Splinter Cell, Far Cry, just to name a couple series I've enjoyed playing co-op.

I must say that I really like Dying Light's co-op system.

No reason to think there would be co-op in any way in fallout 4, but it would be really awesome to game with a friend and have some awesome times exploring the wastelands.

Thanks again for Fallout 4 <3

Unless multiplayer is announced for Fallout 4 (don't hold your breath) we can use the official FO multiplayer suggestions thread: http://www.gamesas.com/topic/1512524-fallout-multiplayer-discussion-thread/