What will happen to apps that have not been updated once I install thE NEW IOS?

I have noticed today that some of my apps have not gotten updates for tomorrow's release of ios seven. What will happen to these apps? Will they be removed from my phone? More importantly, will i be able to install the ios even with these apps on my phone and not effect things such as voiceover?

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#1 They probably just won't work properly

When I upgraded from iOS5 to iOS6, all my applications came along for the ride. My assumption is that all apps will survive the upgrade, but if some won't work with iOS7, they just won't work properly when you try to use them. In these cases, hopefully updates will come out soon to fix these issues, unless of course, development on any particular app has been discontinued.