Shared publicly  - 
Facebook buys Instagram, then announces an independent, standalone iOS photo app. What the WHAT!?
Facebook Newsroom - Today, we're introducing Camera, a new mobile app that makes using Facebook photos faster and easier.
Shawn Xu's profile photoJodi Ettenberg's profile photoDavid Lee's profile photoAkila McConnell's profile photo
Buying not always means needing and sometimes means killing.
That seems to be the most logical explanation, I agree. We'll see what they say when it gets more widely written up!
Well if Facebook really does want to leave Instagram alone, then it makes sense for them to release their own photo-sharing app that's more directly tied to Facebook.