if you are the iOS developer / programmer then you need know the first to which frameworks are New Added and which are updated, without you know this framework you can not develop a New Application and upgrade application from old version.
- Accelerate
- Accounts
- AddressBook
- AddressBookUI
- AdSupport – Added New Framework
- AssetsLibrary
- AudioToolbox
- AudioUnit
- AVFoundation
- CFNetwork
- CoreAudio
- CoreBluetooth
- CoreData
- CoreFoundation
- CoreGraphics
- CoreImage
- CoreLocation
- CoreMedia
- CoreMIDI
- CoreMotion
- CoreTelephony
- CoreText
- CoreVideo
- EventKit
- EventKitUI
- ExternalAccessory
- Foundation
- GameKit
- GLKit
- GSS
- iAd
- ImageIO
- MapKit
- MediaPlayer
- MediaToolbox – Added New Framework
- MessageUI
- MobileCoreServices
- NewsstandKit
- OpenAL
- OpenGLES
- PassKit – Added New Framework
- QuartzCore
- QuickLook
- Security
- Social – Added New Framework
- StoreKit
- SystemConfiguration
- UIKit
All above frameworks details are available in Xcode 4.5 latest stable version, iOS 6 Application development start before you must be read about it. if you are know all frameworks then you can build Excellent quality application.