I think the extremely light font in the new logos simply refers to streamlining and trimming of fat from the respective OS'. For instance dropping all the skeuomorphic graphics resources and optimizing features to work right across both platforms. At least I hope. I love how integrated iOS and OS X are now but they really need some work. There's still silly inconsistencies and problems.
There's graphic inconsistencies within the OSes themselves.
Each release would have a new icon themes, for example, but it wouldn't be applied to everything. So OS X and iOS ended up with a whole jumble of icons.
Remember how Lion had those icons, like for Launchpad, that were shiny brushed-metal circles?
He's hoping Jony had the guts to hunt down every errant icon and update it to a system-wide theme.