All three of your Metal Gear Solid: Peace Walker buddies will love you when you break this "news": Hideo Kojima has confirmed that four-player co-op will return for Metal Gear Solid HD Collection on Xbox 360 and PlayStation 3.
I say "news" because we got our hands on the preview build at E3 earlier this year, and took a sneak peek at the menu. We can now irrefutably confirm the presence of co-op - online only, unfortunately. So far MGS HD has been expected to release this November, but no official date has been nailed down yet.