Here are the release dates from a German dealer catalog (All Releasedates for Germany):
January - Order of Chaos
February - Structure Deck: Dragons Collide / Ra Yellow Mega Pack
March - Order of Chaos: Special Edition / 2012 Premium Collection TIN / Hidden Arsenal 5: Special Edition
April - 5 Card Booster Pack (Duelist Pack Yuma)
May - Galactic Overlord / Starter Deck 2012
June - Gold Series 5 / Structure Deck
Q3 2012
Hidden Arsenal 6
Collectibal Tin 2012 - Wave I
Legendary Collection 3
Booster Pack 44 (Return of the Duelist)
Booster Pack 44 Special Edition (Return of the Duelist Special Edition)
Q4 2012
Structure Deck 23
Collectibal Tin 2012 - Wave II
Booster Pack 45
In Germany, dealers get a catalog of what appears to 2012th And a couple of pages is also Yu-Gi-Oh! Products there. Therefore also have the photos uploaded.