Well, firstly, the last FB update is a complete failure and does not install properly, saying that it cannot be downloaded now, no doubts, the thousands of 1 star ratings the app got yesterday itself. I am again downloading the app today and will notify whether it was successful or not. You have 2 options to remove the waiting thing:
1. Turn off your wifi connection and ensure that cellular data is turned off. A message pops up saying lack of internet connection, and the waiting disappears, and instead 'facebook' appears, but with the sign greyed out. Long tap on it and the. Delete it. Then reinstall it again. This is what i am doing.
2. Ensure that there is no problem with internet connection, like slow internet.
Hope this helps.