Hey guys, long time lurker.
According the the NFL UK site, all the London bound teams are showing the pre-season games on their own websites. Assuming its not somehow region locked, hopefully you guys should be able to watch the Dolphins for free?
http://forum.nfluk.com/showthread.php?t=111007
Go fins!
Good looking out. My guess for us in the US is it will be region locked, as we see with youtube videos and such - would love to be proven wrong though!