TL:DR version
"Windows 7,8,9,10,10X will be way better than all our previous s**t releases. No really it will be astonishingly fast (in a good way) and totally secure. You won't believe how good it will be.
Honest.
Pinky swear*
*Forward looking statements. T&C apply. Statements may be inaccurate, misleading or just plain bu***hit.