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The notes of the G-sharp major scale are: G#, A#, B#, C#, D#, E#, Fx, G#. The x you see is called a double sharp. (Double sharps raise a note higher by 1 whole step. Fx is actually G.) However, because of the simpler enharmonic equivalent of Ab major, which has 4 flats, Ab major is used a lot more than G# major ever is.
In short, the new key would be Bb (B flat) major, so the natural scale to build a melody over this progression would be the Bb major scale. Let's break it down (if you're interested in the theory)... If there were no capo, the key would be G major. This is because all the chords/notes being played would be from the G major scale (you can learn about using this scale to determine and transpose/change key in the chord progressions section)...