i just know that MEW got new design and be honest i like this new design more than the old one it got simplified and more light than the old one on my PC. the old one got lagged when i try to access using private key or add new token.
also there's log out button in this new design and one interface for all so we don't need to sign in every time we want to use another feature.
this will be a great help to new people who just know about ethereum because mostly people got confused the first time they using MEW with the old design.