On the album listings and the album preview pages, there's a play all button. This button will load all audio for a specific album in a playlist, which will start to play automatically. This is how this feature works:
From the Catalog page:
Clicking the highlighted button loads the tracks in the playlist and starts autoplay (upper right corner)
The play button in the lower right corner of the cover art on the "Preview and Distribute" tab has the same function. 