screen scaling

Does anyone know how The Next Penelope handled multiple screen sizes? Did they use scale outer or was it just 16:9 letter box integer scale?

I'm trying to figure out the best method and thought id see how a successful game handled it.

Also If i use a resolution of 16:9 and "scale outer" and have a small screen, then someone plays the game on a much larger screen and different resolution thats still 16:9, will the game just scale it up so it looks the same, or will they see more of the layout? Or is it just when the aspect ratio changes?

Ashley