Can't get the app icons to stop displaying "waiting"
I've had this happen before too. Usually restarting the iPhone/iPad fixes the issue. There's a great set of instructions on how to fix this located here..

http://www.iphonefaq.org/archives/971489


  
  Reboot your iPhone normally. See this link for instructions on how to restart your iPhone.
  If the apps are still stuck on the home screen, try logging out of the App Store temporarily. Navigate to Settings -> Store -> Apple ID
  -> Sign Out. Now open the App Store and Navigate to the Featured section. Scroll to the bottom of the page and touch the Sign In -> Use
  Existing Apple ID. Log in and the stuck apps should reset.
  Still have strange icons on the screen or frozen downloading apps? Connect your iPhone to the computer and open iTunes. Navigate to the
  app store. Install the apps you are having a problem with on the
  computer then sync your iPhone.