Im loving the stills you have withot jar jar. As for the preview I like the way it started. And I can feel the direction you are going with us having to find out HOW AND WHY we got to this point thru flashblback.
I didnt like the very sudden cuts though, Yoda talking about entering the temple and then 5 seconds later he is there fighting. Same with when he tells obi wan he isnt strong enough to take on sideous and straight after he is in front of sideous. Both these events need the illusion of the passage of time, in other words some other stuff being put inbetween.
Also you could lose the "younglins" line (i hate that word) and cut straight to obi wan just looking bewildered by seeing young dead people, yoda explains that they are padawans.
Im looking forward to seeing the rest. Have you considered finding some other way of showing its a flashback rather than the 13 years ago type font ? Hard i know...
Hope you dont take any of this as critiscsim cause i enjoyed it.