If you're talking about the collage with Bridget and Max then:

Bridget is from the lockscreen (if you look closely the green button says slide to answer), and is a Phone call.

Max is a FaceTime, and is likely when the phone is unlocked. There's already a UI difference in iOS6 for these use cases.

Thanks. Though it seems odd that the 'remind me later' - essentially the 'decline' - isn't particularly notable on the phone call screen. The typical scenario of being in a meeting and needing to decline a call is less facilitated by the second design than by the first, as it's not obvious where to perform the action.