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I'm having the same problem. 5 apps with waiting updates. I tried killing from the dock and restarting the iPad as well.

iOS6's "white screen of death." lol.

Finding/updating apps manually through the 'Purchased/All section of the app store was a nice tip. thanks for that.
 
It's working for me now.
Checked earlier this morning (doing the usual, closing from multitasking tray) and still didn't work.
Then about an hour ago gave it another close from the multitasking tray and it works finally. I like not having a badge number on the app! Ha
 
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