Taken from dakkadakka forum. These seem to be US release dates:
12/19/05
White Dwarf 312
Dwarf Battalion
01/02/06
Dwarf Army Book
01/09/06
Dwarf Runelord
Dwarf Warriors
01/16/06
Dwarf Master Engineer
Dwarf Lord With Great Weapon
01/23/06
Dwarf Joseph Bugman
Dwarf Grudge Thrower
01/30/06
Dwarf Lord With Hammer And Shield
White Dwarf 313
Dwarf Cannon
Dwarf Thunderers
Black Templars Chapter Upgrade
02/06/06
Dwarf Slayer Lord
Dwarf Slayer Command
Dwarf Slayers Blister
Dwarf Slayers Box
02/13/06
Dwarf Bolt Thrower
Wood Grove Pack
02/27/06
Dwarf Lord With Pistol And Axe
Dwarf Thorgrim Grudgebearer On Throne
White Dwarf 314
03/13/06
Tau Ethereal Caste
Codex Tau Empire
03/20/06
Tau Crisis Battlesuit Commander
03/27/06
Tau Pathfinders With Rail Rifles
White Dwarf 315
Tau Sniper Drone Team
Fallen Giant Template (Tentative)
Tau Piranha
04/10/06
Giant
04/17/06
Tyranid Lictor – Death Leaper
Vostroyan Platoon
Tyranid Biovore
04/24/06
Tau Vespid Stingwings
Tau Vespid Stingwings
Tau Aun Va , Master Of The Undying Spirit
White Dwarf 316
05/01/06
Fall Of Medusa Five
Tau Sky Ray
Imperial Guard Vostroyan Firstborn
Tau Commander Shadowsun
05/08/06
Vostroyan Lascannon Team
Imperial Guard Vostroyan Command Squad
05/15/06
Vostroyan Mortar Team
Vostroyan Officers
05/22/06
Vostroyan Assault Weapons
05/29/06
Ork Kommando With Burner
Razor Wire
Cities Of Death Battlemat
40k Buildings: Imperial City
40k Expansion: Cities Of Death
White Dwarf 317
Urban Basing Kit