Pocket Casts just received an update to version 4.1, bringing a new "dark" theme and several notable playback improvements. Even though it just recently made the major jump to version 4 with a complete redesign, the updates don't stop there. Version 4.1 has a new dark theme, which should be easier on the eyes when viewing in dim environments and generally just please the crowd that likes a darker UI. On the playback side, v4.1 adds global playback speed options, set "start from" times for episodes, larger buttons and various other little fixes.
If you haven't taken a look yet, the new and redesigned Pocket Casts 4 is certainly worth consideration. You can grab a download from the Play Store at the link above, and stick around after the break for a quick side-by-side comparison of the light and dark UI.