The site for Cassini’s raw images has been rushed by space enthusiasts today, so it isn’t easy to access the full images. As far as I know most or all of them are taken on eclipsed Saturn-shine —the light that gets reflected by the rings and the atmosphere— and also the shine of Rhea and other nearby moons. The raw previews are provided in lossy JPG format, so they aren’t suitable for trying to spot the ice geysers:
