While AMD's new Zen architecture will also use the Socket AM4, the first AM4 chips are believed to be Excavator-based Bristol Ridge processors.
The leaked chips, which have been sent to AMD’s testing facilities in India according to the shipping data, almost certainly belong to the Bristol Ridge family of APUs. We have one batch of quadcore APU prototypes with a 65W TDP and one batch of quadcore CPU prototypes with the same TDP. Both chips have been shipped within a couple of days of each other in late October.