Funk Knight aka Death Knight in 3.1

It was only a matter of time so I might as well break the ice. Death Knights are getting some major tweaks for 3.1. Most "safe" practices in 3.0.9 are no longer valid. Enter this thread. We should focus on discussing:

DPS Specs
Tank Specs
Rotation/Priorities

After a little bit into 3.1 I'd like to welcome tips specific to Ulduar boss encounters for DKs, but in this early stage of release, please keep spoilers down to a minimum (i.e. ZERO). On a final note, let's try to be civilized and not just bash another person's ideas. Constructive criticism ftw.

Also, I'm well aware of sites like Elitist Jerks, but I think anyone who frequents the site can attest to the large amount of garbage and well...elitism that lurks its head there.

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So, Dual Wielding: In or out? I'm pretty sure a "viable" spec can be made, but viable usually means "not the worst." Most of the DW talents seemed to be nerfed down a little bit which immediately draws my gaze to 2-Handers. Diseaseless builds kinda got the axe, so there goes that idea. The stable Unholy build should still be viable, but there has definitely been some talk of a single-disease Frost build that makes use of the Howling Blast glyph. I'm eager to jump into the patch and actually try some of these things out. I'll bring any successful findings here! Anyone else have any thoughts?