That is the point, a new pre-rendered FMV wouldnt generate much, if any hype. Because it is what happened before, it would just be the same receipe as before, and i garauntee you now people will just start complaining about everything because in the end, v2.0 is to replaced flawed game mechanics and server issues, that is the main concern people have and they want to see these things fixed. CGI shows nothing. You are not paying monthly to play the game to watch the CGI over and over and over.
If on the other hand they showed lots of gameplay and be like "look we fixed this, we fixed that, look at all this variety of things, your fave chars and how they now look in v2.0, the new char creation, the new environments, we did it", people would wet themselfs and it would bring back instantly all the attention it has lost.
It is all about that first impression that have to recover, the only way they can recover it is by showing that all the problems before are now gone.
