The upcoming iTunes will come with a new sidebar that makes it easier to switch between different categories of content like recently added, artists, albums, songs, and genres. The new Sidebar is now to be slightly easier to use.
Other changes including the slightly redesigned mini player. The Mini player will move the Up Next functionality to the right side. Make it easy to use for end users.
It is not clear when Apple will push new iTunes update. But as leaked reports say new update may come next month.