Actually, I think the opposite is true. Instead of seeing new desktop versions without feature parity, we will finally see the iOS/Android/MacOS/Web versions of the Office Suite get feature parity with the Win32 versions because they will all be built from the same codebase.

I know that it's common for rewrites to not approach feature parity, but I think Microsoft is aware of how much people rely on Excel and Word and will make feature parity a high priority because of that.