IOS VERSION CODE NAMES

While iOS doesn't enjoy public code-names like OS X - no Snow Leopard or Mountain Lion - they do use internal code names, typically derived from ski resorts. Here a list of previous, current, and future iOS code-names.
1.0: Alpine (1.0.0 - 1.0.2: Heavenly)
1.1: Little Bear (1.1.1: Snowbird, 1.1.2: Oktoberfest)
2.0: Big Bear
2.1: Sugarbowl
2.2: Timberline
3.0: Kirkwood
3.1: Northstar
3.2: Wildcat (iPad only)
4.0: Apex
4.1: Baker
4.2: Jasper (4.2.5 - 4.2.10: Phoenix)
4.3: Durango
5.0: Telluride
5.1: Hoodoo
6.0: Sundance
6.1: Brighton
7.0: Innsbruck
7.1: Sochi
8.0: Okemo
8.1: OkemoTaos
8.2: OkemoZurs
8.3:
8.4:
9.0:
We'll update as new versions are released or otherwise become known.