This is the beginning of the end folks. The iOS interface appears dated and this is actually a step backwards.
i said this before and i'll say it again. by 2015, there will be no consumer Mac. Only iOS devices.
I would LOVE this. No one uses scroll bars since you have two finger scrolling, which makes it 100 times easier to scroll. The Windows folks are still limited to scrolling by notches (as opposed to pixels) and only vertically, so it makes sense to have scroll bars there. But on OS X, there isn't really a point.
And we have inertial scrolling now, it would make sense to also have the rubber banding.
Makes sense, current scroll bars are starting to look very dated.
Is the event being streamed, like last time?