I would be inclined to go with the same starting 11, albeit with a 4-3-3 formation (Targett in left midfield). I just feel its time for some continuity and a settled side from game to game.
That said, Koeman has made it clear in the past that he picks players and formations based on the opposition, and not just on form, so it wouldn't surprise me if he went with the following line up vs WBA:
Forster
Cedric - Fonte - VvD - Bertrand
Romeu - Clasie - Davis
Mane - Pelle - Tadic
Subs: Stek, Targett, Yoshida, Wanyama, JWP, Juanmi, Long