This is for the demo locks in the guild - for the aff or destro locks, you don't exist because you suck at picking the best spec!
Right now, LFR lei shen trinket is basically better than almost anything in SoO, even heroic. Basically, unless you will be downing heroic garrosh anytime soon, you should have ANY version of Lei Shen trinket (UVLS), and the trinket from immersius.
Turns out that the proc changes for rppm actually somehow made our life better. It seems to proc more reliably, and more often. Perhaps it's a bug - and I can't imagine blizz wants lfr gear from previous tier to be better than almost all current tier....but it's true.
So if you don't have UVLS you probably shouldn't be demo!
What's interesting is that the immersius trinket is a % buff and may value mastery over all else. It works insanely well with UVLS as the extra crit dmg is amazing for the doom crit ticks. Also it scales with your gear, so it gets better as your gear improves.
On tier 6 talent, there is NO case when you should be keeping KJC anymore. Default to the new AD for basic single target fights, and honestly MF is freaking amazing now. If you time it right you can do crazy burst with immo aura.
So no more casting on the move? Yep...no problem though because apparently fel flame is almost equal to shadowbolt - in fact it is 3% more dps apparently, but the higher mana cost means it's slightly below. So fel flame is filler when moving, shadowbolt when standing still.