They talked about ancient treachery and pacts. I think they are rather some kind of cursed people.Scholar & Brutalman said:I've been thinking that if the Eladrin and Elves were fey that have colonized the mortal world then 4e Tieflings might be a race of fiends that did the same.
I'm quite sure they will have an unique origin, rather than the various possibility we had in previous editions.