I don't know about all the specifics, but Sony has control of both the Vita and PS Series so I would assume they can make both hardware and software changes to better complement the streaming feature
Maybe Menneisyys2 can shed more light on this if he/she knows more
Have you heard about the Nvidia Shield? I know for that, the streaming heavily depends on your wireless router for the utmost lowest latency. The Nvidia Shield has a strong 2x2 wireless n compatible wifi module