Maybe a little early, but here we go!
Below will be an updated list of boss guides and videos for the new raid instance in 4.3, Dragon Soul. As always, if/when you find useful guides/videos, post below and I'll keep this updated.
Bear in mind that a lot of the initial guides/videos are based on the PTR, and may change on live (or within a week or two of it being live).
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Dragon Soul
MMO-Champion have the Dungeon Journal details extracted for each boss.
Morchok
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
Warlord Zon'ozz
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
Yor'sahj the Unsleeping
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
Hagara the Stormbinder
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
Ultraxion
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
Raiding Guide - tactics video.
Warmaster Blackhorn
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
Angered - tactics video.
Spine of Deathwing
25man.com - tactics.
Icy Veins - tactics.
Learn 2 Raid - tactics video.
YouTube - kill video (Rogue PoV).
Madness of Deathwing
Icy Veins - tactics.
Learn 2 Raid - tactics video.
YouTube - kill video (Rogue PoV).
Baradin Hold
Alizabal
Icy Veins - tactics.
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Cog