Would anyone happen to know if there's a problem with the glyph of FS on the live servers? For 2 days now, doing dummy testing, I am unable to cast FS with anything below 30 RP. Or perhaps it's not the glyph but there's another bug/explanation for this?

Duh. Having a really retarded day. Thanks, and sorry for the idiotic question.

Razorice Doubles your KM procs cause when it procs, it can proc off KM also. Its a bug.

Death Knight (Skills List / Talent + Glyph Calc.)
Frost

Howling Blast damage has been doubled (from 259-281 to 518-562 for max rank), cooldown changed from 5 seconds to 10 seconds.
Frost Presence now reduces spell damage taken by 10%. (Down from 15%)
Guile of Gorefiend now increases damage done by your Blood Strike, Frost Strike, Howling Blast and Obliterate abilities by 5/10/15%. (Old - Critical damage only, 15/30/45%)
Lichborne doesn't increase the chance of your enemies to miss you anymore.
Blood

Dancing Rune Weapon now lasts 20 sec (up from 10sec) and last 2 (up from 1 sec) sec per 5 additional runic power but attacks for ?% reduced damage.
Will of the Necropolis now cannot occur more often than once every 15 sec.
Might of Mograine now increase all damage done by your Blood Boil, Blood Strike, Death Strike, Heart Strike, and Obliterate abilities by 3/7/10%. (Old - Critical damage only, 10/20/30%)
Vampiric Blood cooldown has been increased from 1 min to 2 min.
Blade Barrier now decrease damage taken by 1/2/3/4/5% for 10 sec.
Unholy

Bone Shield cooldown has been increased from 1min to 2min.
Ghoul Frenzy cooldown has been removed.
Blood-Caked Blade proc limitation has been removed. (Old - This effect cannot occur more often than once every 3 sec.)
Outbreak now Increases the damage of Plague Strike by 10/20/30% (Down from 15/30/45%) and Scourge Strike by 7/13/20%. (Down from 10/20/30%)
Necrosis now affects all your auto attacks. (Old - Only Main-Hand)

Latest PTR builds. The increased Howling Blast damage suggests that rime procs may turn into a significant source of damage instead of something that I sometimes do if I have a spare GCD, guess testing will tell.

However, the biggest suprise is the Guile of Gorefiend change. Correct me if I'm wrong, but this suggests that crit is going to lose even more value that before, and with the Unbreakable Armor dps buff, the stat value of pure strength is going to go through the roof.

The GoG change is also quite a big nerf for Frost raiding, in my gear I was sitting at ~70% crit for both OB and FS on the PTR.
Pre-change: 0.3*1+0.7*2.45=2.015
Post-change: 0.3*1.15+0.7*2.3=1.955
That's a 3% total damage nerf for me, probably a bit less when they fix Razorice proccing KM but the talent is balanced around a 50% crit chance, so you'll always see a damage loss as frost.

Move the discussion to the new thread please; there's no reason to make a new frost thread when the old one continues to get used.

So in response to OP's question, with the recent patch what would you consider to be the best Frost Duel Weild DPS spec?