I've heard Cheers twice on the radio now, I love the song.
Anyways, she just finished recording a new EP, and it's going to be released in the Fall. MTV published an article calling it an album, but I really think they mean new EP.
Read it here:
http://www.mtv.com/news/articles/166...ns-album.jhtml
It isn't a 6th album, because Rihanna already said on twitter that the Loud era continues with new music: Same era, New Music.