So this tweet from The Cataracs was spotted not too long ago. While Cryptic, we can see that the individual they are working with is a female and a "big B."
The Cataracs also posted a picture with Sia earlier today.
While it might just be possible that they're just hanging out with Sia, these tweets from Sia's account suggest she's also working with someone huge in NYC, and it's most likely the same "big B" that The Cataracs are working with. In fact, Sia has expressed a desire to work with Beyoncé in the past!
What do you guys think? I would be ecstatic if this turned out to be true!