Yep, same boat. I submitted updates to each of my three apps last Saturday, 7/12. Nada. I sent an email over to
dts@apple.com. I received a reply yesterday from them saying I should contact
http://developer.apple.com/contact/ instead.
I'm sure what is happening is they are backlogged like crazy on apps in the App Store given the volume. Generally speaking, I would think Apple is making new apps a higher priority than updates.
If you REALLY want to get your code out to the App Store in a matter of hours, you could simply submit it with a different name as a different app. Users may not like this though.