I'm really hoping SMS isn't a single, it's a letdown. It's not terrible, I actually really like it but it's just not single material as I was expecting. It's listed on the sticker but hopefully that's just to get people to check that track & see that it has Britney and hopefully encourage them to buy the album.
Her best WB follow-up single choices would be "Drive", "Adore You" or "Maybe You're Right" in my opinion.