Rihanna announced today via a response to a fan tweet about when her new album would be dropping and she simply said "THIS FALL".  She did not give anymore than that, no title, no date, nothing.

She has hinted that she would like to keep some of the dubstep influence that was on her 2009 album 'Rated R'.  It is also speculated that there will be tracks on the album produced by the studio team known as the Jugganauts (Verse Simmonds and Sak Pase), who produced Rihanna's single Man Down.