It's blue, and I think I even recognize the staging (from the videogame cutscene, wasn't it?). Even if it's not "the canon death of Shaak Ti", it's something that makes us think of Vader purging the Jedi, and that's the intent, if you ask me. Well - of course Yoda wouldn't need to ask about the future to get information about the Dark Lord; unless he thinks Qui-Gon only knows about the lives of the people he was connected to, and who might only find out about Sidious in the future. Which might be wobbly writing after all. As it stands, future or not, Qui-Gon can't tell anything period, and since he's outside of time, he obviously couldn't change what's happening (that's predetermination for you) since it kind of already has all happened for him, from a certain point of view. It's debatable whether him showing hints to Yoda is a loophole or part of "the plan".