A tip for frost DKs who pvp and pve. DO NOT Dual wield in pvp. Basically what you need in pvp is big burst damage correct? So, in esscense, to use a two hander and stack mastery is the proper way to do things, because stacking crit is almost useless due to killing machine, so when stacking mastery and killing machine procs with a two hand weapon, thats BIG dmage with Frost Strike/Obliterate. Also pertaining to talents, if you are dual wielding in PVE, looks like youre going to have to say goodbye to your blood/unholy offspec, because you're going to want Might Of The Frozen Wastes. You would also have to respec for On A Pale Horse because for battlegrounds this is a very nice talent, but not SUPER necessary. On the other hand, 2H Dks already most likely wont have to worry about respeccing. also make sure to get the Death Grip Talent in the unholy tree and
[Glyph of Resilient Grip]
and
[Glyph of Death Grip]
Another nice thing to note, this can also serve as a hybrid PVP/kiting spec, as chillblains is quite dandy for PVP, but you will need
[Glyph of Howling Blast] in the spec. Also for kiting improving your Death and Decay is a smart decision aswell.