Sorry if I am late with this must just noticed my Google settings app on my nexus 7 has turned grey, compared the version number against the leaked n5 apk I side loaded on my n4 and it matches. Same in my wife's n7, so Google have updated play services. Must be getting ready to push KitKat soon!
Still the same green on my N7, but it starting to hit is kind of telling. Hope to hear of KitKat getting pushed this week.