"Simultaneous connection to a Wi-Fi Direct-certified group and an infrastructure network is an
optional feature." From what I can tell, it more or less is a 1-on-1 (or 1-on-many depending on device's settings) automated AD Hoc (with pre-defined settings). Since connecting to both a Direct Connection and infrastructure network at the same time is optional, I assume it would have 2 WiFi devices installed to do this (if it only uses 1 device to do both I'd be surprised). As such, it's very similar to a laptop that has 2 WiFi units, 1 connecting to a local hub and the other running in AD Hoc mode. It sounds like WiFi Direct just simplifies it for the average person into a plug and play style. Nothing really new from a technology viewpoint, it's more a new standard to make implementation and certification of existing tech easier.