I noticed something really great with that 470 Healer haste trinket from Brewfest (previously nowhere near BiS).
5.1 changes recap
Renewing Mists: transfers targets when it heals (higher haste, faster jump rate)
Heroism: +30% Spell haste, instead of +30% cast speed.
35% Chi gain rate on Soothing mist (higher haste, higher Chi proc rate)
Thousand-year Pickled Egg: +904 Intel. Chance to increase your haste by 5425.
but now that we gain 50% haste from items in 5.1, it jumps up to 8168 haste. not in the tooltip, but in the end effect. +~20% spell haste
for the sake of seeing how dramatic our haste buff is, Essence of Terror (509 Heroic ToES) grants 7796 haste baseline on magic dmg. we gain more haste from this 470, then we would have in 5.0 with Essence of Terror.