Good question Bossk. If Grevious had not been in Clone Wars, then I would have said its probably not a spoiler. But with Grevious, not to mention it does technically come after the last thing you wanted to see before 3, AOTC, I would say it is a medium level spoiler. High level spoiler being something like they posted on theforce.net a few days ago and then was inexplicably taken down.
