Some of the highlights in iOS 7.1 worth mentioning

iOS 7.1 features CarPlay support
Siri in iOS 7.1 lets you manually control when she listens by holding down the Home button while you speak and letting it go when you’re done
Touch ID fingerprint accuracy and reliability has been improved
Camera app has a new ‘HDR Auto’ feature
Photos & Camera tab in iOS Settings has a new ‘Upload Burst Photos’ option
you can now use a new ‘Darken Colors’ option under the Increase Contrast section of the Accessibility tab
the Phone app has a new-look dialer
you can disable Parallax effect independently of other animations when setting up wallpaper
iCloud Keychain is supported in additional countries



Other tidbits

instead of saying ‘No Missed Notifications,’ Notification Center now just says ‘No Notifications’ when an alert is cleared
there is a new Yahoo logo in both Notification Center and the Weather app
you can now enable or disable bold text without restarting the device
a new dialogue appears when restarting iPhone 5s, which reads ‘Touch ID requires your passcode when iPhone restarts’
new iPad wallpapers
‘Touch ID and Passcode’ has been bumped up to the main menu in iOS Settings
list view in the Calendar app has been redesigned
you can now enable button shapes
animations and transitions are noticeably faster
iOS keyboard has new Shift/Backspace key highlights
the slide-to-power-off UI has been redesigned
icons for Phone, Messages and FaceTime apps have less vibrant colors
Music apps has new Repeat and Shuffle buttons

As previously rumored, iOS 7.1 unlocks Apple’s newly announced in-car integration feature dubbed CarPlay, launched at last week’s Geneva Motor Show with initial support from Mercedes-Benz, Ferrari and Volvo.



From Apple’s changelog for iOS 7.1

CarPlay
iOS experience designed for the car
Simply connect your iPhone to a CarPlay enabled vehicle
Supports Phone, Music, Maps, Messages, and 3rd-party audio apps
Control with Siri and the car’s touchscreen, knobs, and buttons
Siri
Manually control when Siri listens by holding down the home button while you speak and releasing it when you’re done as an alternative to letting Siri automatically notice when you stop talking
New, more natural sounding male and female voices for Mandarin Chinese, UK English, Australian English, and Japanese
iTunes Radio
Search field above Featured Stations to easily create stations based on your favorite artist or song
Buy albums with the tap of a button from Now Playing
Subscribe to iTunes Match on your iPhone, iPad, or iPod touch to enjoy iTunes Radio ad-free
Calendar
Option to display events in month view
Country specific holidays automatically added for many countries
Accessibility
Bold font option now includes the keyboard, calculator, and many icon glyphs
Reduce Motion option now includes Weather, Messages, and multitasking UI animations
New options to display button shapes, darken app colors, and reduce white point
Other
New Camera setting to automatically enable HDR for iPhone 5s
iCloud Keychain support in additional countries
FaceTime call notifications are automatically cleared when you answer a call on another device
Fixes a bug that could occasionally cause a home screen crash
Improves Touch ID fingerprint recognition
Improved performance for iPhone 4
Fixes display of Mail unread badge for numbers greater than 10,000
Continued user interface refinements