Wordnafnikufesin said:You missed my point. The fact is that they DO know who's singing but are keeping it a secret (I understand the whole contract thing). But that is different than saying they don't know who's going to be singing, which they've been saying all along.
Saying "I don't know" avoids the question, and leads it to being asked again, because nobody buys that. Saying "We can't answer that question yet due to contract obligations" still avoids the question, but would have been better at shutting us up, because at least then we're getting an honest answer.