I was also wondering about this, there seems to be a purple color on the website right now but it isn't on the Sally so I'm not sure really.
This is the purple color for reference. Looks the same as the one they used on the Sally. It would make sense for them to bring it back, it was the best Sally color IMO.
Also looking for a Sally (any color except beige and grey) ..the ones on ebay are pretty $$.. let me know if anyone spots one, am ok with a used sally!