"Edit|Invert selection" menu item is missing from build 7057 as you can see from the screen shot below.

If I have a folder with 1000 files and I have to choose 999 files of them, do I just have to click them (with Ctrl) one by one? That'll take hours!
I would just like to click the file I don't want to choose and then I'd like to choose Edit|Invert selection. Bingo! 999 files selected! It's as simple as that.
Why did they remove that neat feature in the first place? Invert Selection has been with us since Windows 95, at least. Correct me, if I'm wrong.
To-do for Microsoft:
- Bring back "Edit|Invert selection" menu item to Windows Explorer!