The meta is most definitely dependant on playstyle. There's a few metas that you could use for healing, I think they each have their benefits and like Narox said it depends on playstyle:
Trenchant Earthsiege - 21 Int, 10% Stun Duration Decrease
Forlorn Skyflare - 21 Int, 10% Silence Duration Decrease
Revitalizing Skyflare - 22 Spirit, 3% Increased Critical Healing Effect
Destructive Skyflare - 25 Crit, 1% Spell Reflect
Ember Skyflare - 21 Int, 2% Max Mana
Of those I'd say your best bets are either Trenchant, Ember maybe Destructive if you really love crit. In reality, you should pick whichever one helps you with what you suffer from most.
- More DK stuff:
Unstoppable Agressor's Ring > Stormrage Signet Ring when over hit cap
You gain 12 ap and .50 crit as Frost, 28 ap when Pillar of Frost is up, 24 ap if unholy. Unholy can't afford it with that gear due to missing hit rating, but Frost Build, atleast the dual wield build can.
Blackened Naaru Silver > Battlemaster's Trinket for Frost DK's
IMO, This is because Frost already has a decent amount of healing/damage protection and the increase to health won't help that much outside of using Death Pact. On the other hand, the Blackened Naaru gives you a ton more AP, esp as Dual Wield. It averages out to around 150 AP avg for Dual Wield Frost Dk's, then you also get the 52 haste. Unholy probably prefers the Battlemaster's trinket due to having less healing and needing that boost when they Death Pact.
Talents for DK:
Many DK's will take On a Pale Horse, and Merciless Combat over Rime + 1 point in RPM. This difference is -10 Runic Power Cap, no free Howling Blast every 2nd Obliterate but you gain 30% less duration on all slows, and 12% more damage when it really counts (execute range). Merciless Combat + Rime are interchangeable IMO, OPH is much less so, it helps alot with mobility. That said, I've seen it both ways and it depends on playstyle. It should be noted that as a pure dps stat outside of pvp, Rime is insanely better. It's better for overall damage in PVP as well, but I find merciless combat to give me more when it really matters.
TL;DR: On a Pale Horse > Rime, Rime = Merciless Combat
The glyph used (Howling Blast) is great for Battlegrounds, but it is a lot less useful in arena. In battlegrounds you can use howling blast to spread frost fever to a huge group, but in arena all you really get out of it is not having to apply FF via Chains of Ice, which is a spell you'll probably cast anyway. The Frost Strike glyph is much much better in arena. Basically if you have a string of 160 RP coming in over time, it allows for 5 Frost Strikes instead of 4.
TLR; Frost Strike Glyph > Howling Blast Glyph in Arena
The Blood Tap glyph is superior to Horn of Winter. HoW simply makes it easier to up keep which isnt hard at all, Blood Tap allows for a quick rune conversion w/out losing ~2-300 health.
TL;DR: Blood Tap Glyph > Horn of Winter Glyph
Absolutely fine IMO.
Big Mis-step here.
There is absolutely no use for Nerves of Cold Steel for a 2H build. You dont get hit rating that applies to Apolyon, and you don't have an off-hand. The three points are being wasted.
I prefer the same talents as above here, but I take RPM in my 2H build.
In other words, -3 Nerves of Cold Steel, +2 RPM, -3 Rime, +2 On a Pale Horse, +2 Merciless Combat.
Feel free to subtract the 2 from Merciless Combat to fill out Rime if you must, I might try the talent out again sometime soon.
Same situation w/ glyphs
Howling Blast = BG glyph, Frost Strike = Arena glyph
Blood Tap > Horn of Winter
Blood Tap can be invaluable especially when you need a rune to strangulate or get that one last blow in.