Apple releases iOS 4.3.2 and iOS 4.2.7 today.
iOS 4.2.7 is for iPhone 4 CDMA model:
- Contains the latest security updates
 
iOS 4.3.2 is for:
- iPhone 4 (GSM model)
 - iPhone 3GS
 - iPad 2
 - iPad
 - iPod touch (4th generation)
 - iPod touch (3rd generation)
 
Fixes in iOS 4.3.2:
- Fixes an occasional graphics glitch on iPod touch (4th generation)
 - Resolves bugs related to activating and connecting to some cellular networks
 - Fixes image flicker when using Apple Digital AV Adapter with some TVs
 - Resolves an issue authenticating with some enterprise web services
 

