Q: In App Store, I am told I have 3 updates now, but I can't open the updates window. All other parts of App Store open, just not updates. Any thouhts?

Yes, numerous people are having issues. It appears to be an Apple server-side issue. They are "working on it"

Try this workaround

App Store>Purchased>Select "All"

Note: Look out for apps that have the word "Update"

http://i1224.photobucket.com/albums/ee374/Diavonex/9c256282736869f322d4b3071bbb2 a82_zps51a6f546.jpg

That's funny, I have. 6 updates waiting and when I go to purchase, none say update.

iPad 2     iOS 8.0.2 

Similar problems + various irregularities....

I had 4 updates waiting.

Tapped the 'update' rectangle which started the update circle to just - circle and circle, and circle - ad infinitum - without any updating actually happening.

Sometimes the circles would get stuck/greyed out.

After 3 days of wondering I connected (USB) the iPad to my Mac (Power Mac G5 - yes) with iTunes opened up. I got the pop up window "trust or not trust' this computer.  I tapped 'trust' and THAT WAS IT.  I waited some 5 minutes before disconnecting.  Next thing I know all things seemed normal. Updates behaved as hoped for and good speed when surfing.   Perhaps the fact that the same 2 machines (G5 Mac/IPad) were used for the initial syncing helped.