Okay, about the bug appearing with the launch of the second wing in LFR, it seems like my guildie was wrong about that.
I read the link to the blue poster and I find it really weird that a lot of us are having the exact same feeling - he does walk slower - based on how far he would walk pre 4.3 and how far he walks now (that is in a straight line).
Could it be that the intention was to change the animation but at the same time the change actually did make him go slower as well? I mean we already know he's a buggy boss, so maybe it's not that far out to think that we're right about him being slower......