iOS8: Fullscreen caller pictures are coming back (?)

So I didn't see it mentioned anywhere, but did anyone else catch (during the WWDC keynote of course) the iPhone showing an incoming call with a fullscreen picture of the caller? I can't seem to find it now, but I think it was a picture of a guy pointing his finger right at you and Craig Federighi even made a comment about it.

I'm very excited about it but at the same time I'm worried for all the iPhone 4 owners, who won't be getting iOS 8. This may mean they are permanently stuck with the ridiculous little cirlcle pictures that arrived with iOS 7.1. Or maybe they'll reintroduce it in a point update to 7.1? Time will tell.