my proposal today is very simple and maybe relatively easy to implement.
This is actually been discussed a while ago but we may didn't realize that this functionality is basically already there.
I know that u can kinda easily resolve this by deleting the current files and retrieving them all again but when u got 10k files to re-download for each of the 5 ORG's , this operation can take very long time.
So i found out that if we use the delete Metadata function from the IC right click menu and in the next window select local only u can basically see all the outdated metadata!
So the only thing that is missing here is the ability to select them individually and a maybe a new button that gives us the ability to delete the selected files.
I also leave here the usual gif ( http://bit.ly/2GcdaIs ) :)