It's like she gathered the sounds from 3 of her albums and put them together into Talk That Talk. Judging by the snippets, the album has a variety of influences, House, Dancehall, and Pop. The album is very consistent and coherent with its message, and Rihanna has been heavily involved with this album (compared to her other albums). I personally believe she is evolving artistically, just because it isn't a dramatic change like Rated R to Loud doesn't mean that there isn't a change at all.

Hopefully they do change once everyone hears the entire thing.