I said that it may need testing for the time to ensure the SegWit definitely works.
I know fundamental SegWit information, but read it in around May so may need to revisit it. As it is the storage of transaction mesages inside the first part of the transaction (where sending addresses are stored)!
Everything requires some sort of testing to ensure it works correctly! As it changes some pats of the way that future transactions may be stores, it will take some testing for security purposes, even if it is a soft fork of the development.
It is interesting to knw that it was added to the client in April and the developers are still waiting on its activation for the network if no testing is needed?