In mid-December Cassini will fly by Dione at a distance of 81,000 km. I did a few quick renders showing the viewing geometry:
http://www.mmedia.is/bjj/misc/css_stuff/di...041214_2300.jpg
http://www.mmedia.is/bjj/misc/css_stuff/di...041215_0130.jpg
http://www.mmedia.is/bjj/misc/css_stuff/di...041215_0430.jpg
These have a field of view (FOV) three times bigger than Cassini's NAC. This should yield some great coverage of areas poorly seen by Voyager (in fact these images will be much better than the best images obtained by either Voyager of any of Saturn's icy satellites).
Also Cassini will fly by Mimas at a distance of 114,000 km but I don't know if it will take any images. This rendering has a FOV identical to Cassini's NAC and shows Mimas near the time of closest approach:
http://www.mmedia.is/bjj/misc/css_stuff/mi...041215_0500.jpg
Also there is a 240,000 km Rhea flyby but I also don't know if Rhea will be imaged. Jason ? ;-)