I have upgraded to Windows 10; had a great experience on installation process. But very strange thing is I am not finding a way to pin (ctrl+9 for IE) the Developer Tools to an existing window with the MS Edge browser app. Is it missing?
Correct, pinning/unpinning the F12 developers is not available in current builds of Microsoft Edge (10240). This is a known issue and we are planning to bring it back in a future update.