New Archimonde's Vengeance is interesting. It certainly looks good and look forward to testing it out, I do worry, like Count Zero though, that it might be a bit of a trap, since like Tank Vengeance it will scale with content, meaning high level players using it in Heroic modes and naturally taking more damage will benefit much more from it than those using it in dungeons and LFR. However, that those lower level playes are going to see it's so good for high level players will pick it up anyway - unless they were genuinely picking KJC because it's "fun".
I suspect this is a real test for that mindset; with AV and potentially MF offering more damage suddenly becoming more fun than move-casting amongst the community.