1.I'm not sure about that HoJ, it's most likely a bug that it shows for "all attacks", anyway rogues and warriors will crucify you for rolling on it. And i tested it on last session - it wasn't working from ranged attacks(while thunderfury did for some reason
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2.Those Devilsaur pieces are good, no doubt, but they're BiS for rogues as well, and there will be "thousands and thousands of them", and i bet every fucking one of them will try to get these pieces (via leveling up skinning+lw), so those devilsaurs will be on farm 24/7 for the first 2-3 months. In short - YOU WON'T GET THEM. Oh and also they've been added in 1.11.1 accordting to wowhead, so they may not be added from the start.