Naughty Dog has an open job listing for a dedicated Co-Op game designer (not multiplayer)

• Co-op AI & encounter design - designing and scripting co-op combat encounters, AI behavior design, and difficulty balancing
• Co-op system design - creating mechanics, game modes, progression systems, reward structures, social features, etc. to serve the co-op experience. Creating and iterating gameplay designs with the team, and working in script to implement and/or tune them
• Being a producer for your levels and gameplay designs - collaborating across disciplines to get work done and clear dependencies, ensuring deadlines are met, and championing the gameplay

Source: http://www.naughtydog.com/site/caree...esigner_co_op/

Speculation as to what they may be doing and compacted info from job listing:

http://www.igameresponsibly.com/2013/12/02/naughty-dog-is-developing-a-cooperative-mode-in-an-upcoming-game/

(Originally from GAF: http://www.neogaf.com/forum/showthread.php?t=726862 )

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Omg is it for UC4? TLOU2?

1P - Jak

2P - Daxter

Doubt it would be for the new Uncharted. Sounds like the kind of thing that would be perfect for TLOU 2. Whether it be joel and ellie(what I'm hoping for) or two new protagonists.

Edit: But it could be for the co-op stuff from uncharted.  Still think it might be for TLOU 2.

pretty much this. 

Jak and Daxter or Crash and Coco hopefully but it's probably for Drake and Sully which is still awesome. Please don't be for a LoU sequel. That game should be left alone as a SINGULAR experience. Don't diminish its greatness with sequels the story was perfectly served for ONE EXTRAORDINARY game not a series. Let it be remembered in all its glory instead of becoming Halloween (too many sequels) or Star Wars (prequels) and diminishing its legacy. No one is asking for SotC 2 or Heavy Rain 2.

I'd sure hope not.

fo dat space game yo

This! No more Jak&Daxter, thank you.

http://www.igameresponsibly.com/2013/12/02/naughty-dog-is-developing-a-cooperative-mode-in-an-upcoming-game/

"If you’re saying to yourself, “they’re talking about multiplayer.” No. They aren’t. There’s a separate listing for multiplayer."

http://www.igameresponsibly.com/2013/12/02/naughty-dog-is-developing-a-cooperative-mode-in-an-upcoming-game/

"If you’re saying to yourself, “they’re talking about multiplayer.” No. They aren’t. There’s a separate listing for multiplayer."