An example is currently being able to have large (almost 2 gb) GPS map files relocated from internal SD to external SD with build prop changes - will that even be possible with official KitKat?
I would like to see users post their results in this area alone here, Otherwise they will be spread all over the other threads. I have not flashed it yet due to installation issues, but when they are sorted out, this one problem are may still make it not worth the effort.
Update - it looks like there may be an easy fix:
If that does not work as-is on M919 - probably will be one soon that does.