Edit: ZeniMax post in this thread indicated it to be a future feature so dont' worry tooo much....
...there doesn't appear to be a button to replay the opening introduction video.
Now if you know how to play BINK files you can view it anytime however for most players a one-time runthrough of an epic opening isn't enough.
In case you missed it I typed up this text yesterday:
The Storm is Comming... The Scent of War Swells in the Air...
As the Imperial Throne Lies Empty, the Fate of all Tamriel Rests on the Strengh of a Common Prisioner's Soul...
Evil Awakened: A Long Banished Foe Stires. Thoughs Who Would Destrtoy Tamriel, Seek Out Agents to their Dark Plot. And So... Death's Long Arm Reaches Out.
It is the 582 Year of the Second Era: The Drums of War are Sounding.
This is Where Our Journey Begins...
Indeed it is so...