I want a Tesla. Based on me saying this, do you think that I'm definitely going to buy a Tesla? Well, I am not, because I haven't got the money.

A statement of personal desire on the part of one individual is different from a statement of intention or interest on the part of Apple. Lattner specifically says alongside his personal desire that they haven't even considered open-sourcing Swift.

So what am I looking for? A statement to the effect that Apple will open-source Swift.