digitalkamera.de currently writes (in German – this is my translation):
“Birth of Sony T300, S750, W110, W120, W130, W150 and W170
In the middle of the night, they have been born, the Sony septuplets – and they’re doing fine. Among them are five identical twins: […]”
They mean the W models which differ only little:
W110: 4x zoom, 7,2 megapixels,
W120: 4x zoom, 7,2 MP,
W130: 4x zoom, 8,1 MP,
W150: 5x zoom starting at 30 mm, 8,1 MP,
W170: 5x zoom starting at 28 mm, 10,1 MP.
But, erm, then they are no longer twins – or do you nowadays count like that: 2=twins, 3=three twins, 4=four twins, …?