TG Fury isn't actually that much of ahead currently. I don't care if the simulations say so, when in real world the performance is a lot smaller. SMF is quite different story again, but if you have to choose against TG Fury vs Arms, I would test it myself how it goes. There has been only like 1-2 fights where I can clearly pull more dps as TG Fury, but on the rest the bigger numbers falls on the clumsy burst playstyle.
For the numbers... Currently on my 497 ilvl I gear I can do around 75-80k dps sustained dummy dps as Arms, depending on the TFB procs. With priority being on cleave + OP while basically ditching slam in PTR, my dps is around 90k in there. So without optimal rotation and stormbolt it felt quite competitive, so I might test it if it's better with Bloodbath next time, but so far the rotation feels a lot easier and smoother on dps than before.
I know fury scales a lot from mastery, so when I say that I get around 80-85k stable dps with TG fury on dummy (+ critbuff), it might not clearly reflect the raid performance, but overall Arms doesn't seem to be that much of behind next patch. Hell, it's not even know, although being SMF would be a clear choice on numbers if you never get a chance to deside on it. Arms still have superior AoE than Fury though, but nerfing heroic leap might make the difference smaller. Kinda funny that currently you can even outdps fury's bladestorm by doing TC+Leap+WW combos...
@meathead
I don't have problems on being able to stay at protection stance myself, but I've seen a lot of complains about it already and this would made the "issue" more obvious, where people are demanding a "fix" on it. They might just nerf it somehow next patch, if this just goes out like it is, but we will see. I hope it does not.