The rhythmbox package has been updated to version 3.0.3 in Fedora 21. This new release features a new user interface design and several bug fixes, improving online media playback. More can be found in the ChangeLog file.
Blender has been updted to the 2.71 release. This includes new features for Cycles renderer and volume rendering and a baking API. The user interface has been enhanced too. Refer to  for more details.
Calibre has been updated to the 2.0 release. The biggest new feature is an e-book editor, capable of editing ebooks in both the EPUB and AZW3 (Kindle) formats. Refer to  for more details.
Changes in gnome-software affect multimedia packages. The coverage for multimedia applications in Fedora AppStream has increased. Now, these applications will look better in gnome-software.