After a month of iPhone 5 launch Apple has released updated App Store for iPhone, that now includes support for iPhone 5 tall screen, over 1136 x 640 resolution.
Apple Store v2.3.2 for iPhone does not have anything new except iPhone 5 and iPod Touch support.
Download Apple Store v2.3.2 for iPhone
See also:
Apps Support iPhone 5 and iOS 6
Gmail v1.3.1415 with iPhone 5 Support
Facebook Messenger with iOS 6 Support
YouTube App with iPhone 5 Support
Updated Chrome with iPhone 5 and iOS 6 Support
How to Get Google Maps on iOS 6
iPhone Apps with iOS 6 Support