What is (one) waiting for?
One should do the thing being discussed right away. A: "We really need to tweak the system so that users are encouraged to spend more time and money within the game." B: "Well, what are we waiting for? Let's make it happen." She admits that she needs to get out of that job, so what is she waiting for?
what are we ˈwaiting for?
(spoken) used to suggest that you should all start doing what you have been discussing: Well, what are we waiting for? Let’s get started!