I booked a guaranteed inside on the pre-inaugural 4-night Oasis Of The Seas cruise. I was upgraded to a standard outside and it was forward-facing, two decks below the bridge. However on that cruise they only sailed at something like 60% capacity (on purpose) so I think just about everyone got a upgrade. I had a lot of wind noise and also unusable space because of the sharp angle the cabin had at the window as the superstructure sloped downward.
I prefer picking my cabin and sticking with it unless an upgrade to a larger cabin or suite is offered.