People are just shouting out glyphs now without any reasonable consideration behind it.
First of all glyph of Howling Blast, this came up on the WoW-europe forums too (where i try to relay some info we get here), but just think about it for a short while.
What would we possibly gain from glyph of howling blast ?
You can't alter your rotation because you still need that PS. So you're still left with a single frost rune you can not use on anything but......... exactly Icy Touch.
You can alterate your rotation but:
HB > OB > PS > BS
OB > OB > BS > XX
Is the best i can come up with. That means you lose 1 obliterate, unless you get rime procs in which case you still have 4 obliterates.
However you still have a free deathrune (XX) left which you can only use on ? Guess what: ICY TOUCH.
There is as far as i see simply NO GAIN to get from glyph of howling blast, unless you drop epidemic and go with a rotation like this:
HB > Ob > PS > BS
HB > Ob > BS > PS
You give up 2 obliterates (!!!) to be able to make glyph of howling blast work, and better yet you can now spec into the blood tree which is already worse than the unholy tree even without trying.
Did you use a simulator for that or dps on a dummy.
Blood subspec has already been (semi-) confirmed to be a worse option than the unholy tree.
Unless of course you start hitting a dummy without raid buffs, because the crit from blood is quite a lot better without raid buffs (if you have 30% crit unbuffed and 40% crit buffed that 14% crit from blood is gonna be a bigger increase on the unbuffed part).
Also since the mob is not debuffed you miss out on a lot of the good unholy talents that thrive on that. Blood talents hardly scale really. Whereas necrosis and BCB scale insanely well with buffs / debuffs and better gear.
I'm not 100% sure, but if you would have an extra rime proc wouldn't you be able to move an extra FS to the next part of the rotation.
So instead of:
PS > IT > OB > BS > BS > FS > FS
Ob > Ob > Ob > FS > FS
PS > IT > OB > BS > BS > HB > FS
Ob > Ob > Ob > FS > FS > FS
for example. One of the things i noticed with this build is that you actually rarely go over the 80 RP, so you have quite a large buffer with RPM.
I agree things would be easier with Glyph of disease though.
Also on this same note, would it be more ideal to use a 4/4 rotation instead of a 5/3 rotation. As to better spread the Rime procs and GCDs:
OB > OB > PS > IT
OB > OB > BS > BS
And then you can use this sequence as a starter:
IT > PS > OB > BS > BS
and then do OB > OB > PS > IT next instead of 3x OB, and you should be able to fall into the aforementioned rotation.