This was the release timeline of retail and it was great :
Vanilla was release November 23, 2004 (US) (February 11, 2005 in EU)
Patch 1.3.0: 7 March 2005 Dire Maul, Lord Kazzak, Azuregos (3 months after release)
Patch 1.5.0: 7 June 2005 AV, WSG (7 months after release)
Patch 1.6.0: 12 July 2005 Blackwing Lair (8 months after release)
Patch 1.7.0: 13 September 2005 Zul’Gurub, AB (10 months after release)
Patch 1.8.0: 10 October 2005 Dragons of Nightmare (11 months after release)
Patch 1.9.0: 3 January 2006 AQ 20/AQ 40 (14 months after release)
Patch 1.11: 20 June 2006 Naxxramas (19 months after release)
Patch 1.12.1 26 September 2006
The Burning Crusade expansion was released in January 2007.
Source
http://www.wowwiki.com/Patches/1.xRushing releases on this server is totally pointless and it will drive people away due to overwhelming imbalances.