... is the parent equivalent of "we'll see". It basically means that I hope you forget about whatever you are asking for, but I will say something to placate you for now.
Has ANYONE ever gone back to a swap that they kept open and accepted something? Everyone who does it to me just forgets about the swap indefinitely. I only say this because someone recently put a swap request as "keep open" and then a week later sent me a request for something else. Umm... hello? We have a swap waiting in the wings!
I hate the "keep open" option.