Yeah I agree with @FloorFiller. There's going to be a bit of spin on what Emily says in interviews isn't there? She's unlikely to say, if asked, that they haven't decided on the 3rd headliner yet, or that their first choice turned them down/asked for too much money etc.
Saying "it's in negotiations" is suitably vague enough to make it sound like a firm decision has been made and it's simply a case of ironing out the finer details - when the truth could really be a variety of things.
Basically, we know nothing, as usual.