The complexity of our rotation choices are huge. To the point where it really could feel to be too much. It's hard to tell until I get a Power aura setup, weakauras, tellmewhen or needtoknow just don't do it for me.
We have a complex rotation as it is. I believe that FDCL will be the preferred choice over Mindbender and Power word:Insanity.
It's fairly easy to understand that a spell you have that can only be used within a 5 sec window and only hits for 70-78k and removes a dot that hit for 9k normal hits and 22k crits under current conditions is a grey area spell. Also understand that for PW:I to work you need to apply SW:P, watch it's duration. use a gcd to apply SW:I, then use another gcd to re-apply SW:P. all this shit to get 78k dmg or if lucky a 170k dmg. I don't see it working well at all in PvE.
People are saying in PvP it'll be great as a mean to force dispellers to use their 8 sec dispels on SW:P, hence forcing full CC's. Since full CC's is worse then SW:I, dispels will be used for CC's not for SW:P's. Should SW:I become a big hitter like it need to be for PvE to be viable, then SW:I will also hit very hard in PvP and nuke people down. That would naturally end up being nerfed, due to it's effect in PvP, so SW:I will never be a good move in PvE.
Obviously being a Shadowpriest we also bring mass dispell, which should prove to be awesome in pvp with the dispell cd in Mist.
But back to PvE.
Looking at shadowpriest game play without SW:I, but with FDCL, which I see as the better choice of the three available in the lvl45 tier. Mostly due to most of the boss' in Mist require a lot of movement where FDCl will be awesome, paired with instant MBs, Halo and SW:P spamm and a little VT casting.
We need to watch two dots SW:P 19 sec.and VT 14sec.
Fit in FDCL proccs.
Fit in MB Proccs and normal MB off cd
Watch our Shadow Orbs count and apply DP w/ three Orbs.
Watch distance and cooldown of Halo. As it is on Beta Halo is just broken or the other two spells are. With close to perfect distance to mob or mobs will allow halo to hit for 170k+ per target! So it's major to use Halo in the right distance, should it go on live in the current state.
Then add internal cds on trinkets, Weapon and professions buffs. HP for SW:D execute w/ DP spamm.
And remember our Core identification spell now a shitty filler Mindflay every now and then, just to show the evil bosses of the world that we are idd the mighty shadowpriest, not a disfunctional cross breed between a mage and ret paladin or just the forth spec of a Warlock, who sadly, was taking a pee, when the other three specs had an orgy with a goddess and became demigods.
The rotations isnt that hard tho. A bit too much proc play, for my taste but it'll not be a problem. But then on top of this shit we have our most awesome utility to watch for.
Void Shift macro for tanks. A super strong CD.
VE use on special boss mechanics w/ frontloading dmg spells and cds.
Leap of Faith is outstanding if used correctly in special circumstances.
Prayer of Mending w/glyph macro on tanks during progression will be viable, I think. Renew not so much.
Mass dispel on debuff bosses could be very viable.
Hymn of Hope as always and even more so with bad gear on progression.
Tranquility w/ Symbiosis...
Silence and Horror everyone can, but at least it's an option for us in pve now.
We got a ton of options of being life savers while being dps'sers, but we aint freaking hunters who can do well with keyboard headsmashing, our rotation w/ proccs and semi short cds needs some attention, but during encounters I find myself watching grid too much. If all our options are done and used perfectly, I do not see a shadowpriest sitting out on anything due to our utility. But this aint TBC, we've been a mana battery already,
I love the massive amount of choices and stuff to hit, but I really dislike SW:I and it's complicated use, which I know will not be worth it, because if it will be worth it, it'll get nerfed due to it's effect in PvP.
Wall of text, pardon me