Honestly, there isn't really a need for a 5.4 guide. The majority of this content is still very relevant, except Warriors have even more utility. Bladestorm received a buff (making it more viable for damage now), but most warriors seem to be running the double-stun at high-end. It's incredibly powerful, especially with KFC or WMD.
From what I read, a bunch of stuff is outdated. I looked at the top 50 ranked Arms Warriors and only a few took Avatar, none took Safeguard and every one of them took Mass Spell Reflect. So naturally I'm thinking this guide is a bit out of date.