There are some really nice designs here. I really hope that KDE finally gets to pay attention to this. I love simplification of it.
One thing I don’t like here is the login screen. There is too much stuff on it. I think gnome’s login screen, as it is now, is fantastic.
And one more thing, proposal for mindset change: not everything has to be a widget. Some things (like shell) could have layouts: layout as current plasma/windows, layout as gnome, layout as Mac, layout as Win8… If things get well thought out, you can integrate this and switch layouts and not di*k around with widgets. Less moving parts, less problems.
HP: you are not going to get fired. You will quit.