For 2h Frost: PvE sims have multistrike as the top secondary stat but I'm not sold on it in PvP.
There was a tweet a while back that said that 30% multistrike would be 30% chance to trigger in PvP and two 15% chances to proc in PvE. This was done to keep them similar in value while toning down burst from multistrike in PvP.
But it was easy enough to look at damage meters on my rogue in 6.0 (rogue has a passive 5% multistrike buff) and see that less % of my damage was coming from multistrikes in PvP than in PvE content. I also thought it was odd that they would list the PvP proc chance on the character tab. I'm pretty sure it does not work like the tweet said it should and is terrible in PvP.
The tweet is decently old, but I couldn't find anything that said otherwise. I'll probably do some testing at 100 when I have more multistrike stat because it should be really good if it does work like the blue claimed it to.
Just looking at stuff on wowhead it looks like glyph of roots and the new 4 piece will work insanely well together? A little haste can get you ~1 second cast roots that gives you a starsurge charge when it breaks should be pretty powerful opposed to relying on rng from dots.
You really wanna go full haste as ele, for reforging haste > mastery > crit (crit is nearly useless as ele). Gems for red sockets 160 int for yellow 80 int 160 haste and blue 80 int 80 pvp power. Haste is just way too good for ele to miss out on. Lowers the global cooldown, speeds up flame shock ticks which equals more instant lava bursts casts. I was on PTR I don't remember 100% my stats but I believe it was 40-43% haste, and 60-61% mastery. Mastery is good as ele, but you gotta think about it, our mastery proc gives us gimped damage 75% of the original spell where as our haste proc (lava surger) gives us a normal lava burst that can still proc mastery. Also haste is very nice for building up fulmination stacks. Especially after some testing on PTR it's pretty obvious that unleashed fury is the dominate spec (I'd say ele blast was equal to it in Grievous gear) but with these high stats the % scaling of unleashed fury seems to scale higher than ele blast damage, meaning crit is useless.
Thank you. I was about to go insane with so many screenshots of stats and none of them close to optimal. And as a few posts above pointed out, 34.99% haste then full mastery will likely be the best possible set up.