Yes, Vudu streams, so the video starts right away. (They even have a little speed tester built into the app that tells you what your optimum video quality is. Mine pegged the 9 Mbit/sec meter for the full minute, so they easily recommended HDX.

Vudu is now owned by Walmart America. Can't say whether that means they're seeking to provide the service outside of the US or not.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris