Bonds because smexy awesome extra talky-talk time, and I'm not sure about TSON and FoD. I could see either easily being released as the final DLC (TSON because hardest map, FoD because IIRC that was the one made last and would be a nice send-off to the game).
Edit: Wtf is TSOD, The Strongest One's Despair? :P
FEA Board - Official Husbando of RNG Goddess Anna :3 There was a point to this story, but it has temporarily escaped the chronicler's mind.