I just upgraded to iOS 7 dev version. Being beta software, it's to be expected that there is one or the other glitch.

After upgrading I had several apps stuck in a perpetual "waiting" state. The apps could not be launched or removed. Rebooting the phone or re-synching with iTunes did not help.

This is how you can fix the issue...

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Step 3: Reinstall the apps using iTunes

Now back to iTunes
  • In the Library / Apps menu, find all the apps that you need to reinstall
  • Select all the apps, use shift (at least on the PC) to select them all. Important to do them all in one step
  • Drag and drop the apps to your phone in the left menu
  • iTunes will now apply the changes automatically

Now all apps should be reinstalled and working. Hope this helps!