One of the feature differences to Akregator until now was the tray icon representation. Since some time Akregator displayed the number of new items rendered in the item. Liferea only toggled between a shaded and an unshaded globe icon.
SVN trunk now has the same number rendering like Akregator supports. Here a screenshot of the normal icons of both programs (Liferea on the left, Akregator on the right) when nothing new has arrived yet:
And this is how it looks when new items have arrived:
The white on red colors are hard-coded and do not follow the theme. This makes some sense as the blue icon also doesn't and red on white has both a good contrast to the blue icon and most themes.