Pandemonium Unholy DK PvP build

I don't actually dps with my death knight. If I'm in a raid, I'm the tank. What I do with my unholy build is go into battlegrounds and arenas. So the glyphs and talents are chosen for that rather than actual dps maximization.

Talents:

Level 56 Talent:
Unholy blight! With auto diseasing! How could I say no?

Level 57 Talent:
I've put Lichborne here but I'm really not sure about that. I could see a good argument for AMZ or Purgatory.

Level 58 Talent:
Chillblains here. Having a 50% slow is handy, and even better will be the 3sec immobilize from chains of ice. Plus I already get a run speed boost from Unholy Presence.

Level 60 Talent:
Death Pact for the win. As unholy I'll always have a ghoul around, and the new pact doesn't actually kill my ghoul.

Level 75 Talent:
Runic Empowerment. Sometimes I'll get a wierd and useless rune, but the potential burst from getting a good run is totally worth it.

Level 90 Talent:
Currently Desecrated Ground, an extra trinket button is excellent. However, I could see a strong argument for Remorseless Winter. AoE slow with a potential stun is quite nice. Gorefield's Grasp might also be really nice too, having a second yank for people hitting my arena partners might be super nice.

Major Glyphs:

Unholy Frenzy is a spell that I currently never use. It increases haste, but has a pretty nasty dot affect. If I could glyph that to not kill my teammates I'd love it.

Add an offensive dispell to Icy Touch? Sign me up please! This seems tailor made to combat recalcitrant healers in the arena. I'm actually looking forward to chasing down a resto druid, between this and a couple of other talents.

The Death Coil glyph will add an absorb shield if used on allies. That seems like it will be incredibly useful in PvP.

Minor Glyphs:

I can't resist turning my perma-ghoul into a perma-geist. I'll definitely be taking the glyph of Geist.

Again, removing the taunt from Army of the Dead is far too good to give up.

I still like taking less falling damage with the Path of Frost glyph. I could see swapping to Foul Menagerie for the awesomeness of having a rag tag army of the undead, but I've already got a geist so I'll likely keep this as Path of Frost.