OS X Yosemite features
General
OS X Yosemite Desktop

Redesigned user interface, including a cleaner dock
Redesigned stock apps, including Safari, Mail and Messages
Translucent menu bar, toolbars and windows
Initiate a text message by clicking a phone number in Safari, Contacts, or Calendar
Photos in OS X coming early next year — see Photos in iOS 8
Widgets in Notification Center
Today view in Notification Center
Share menu extensions — including app-specific share sheets
Smarter controls and buttons
Custom actions
New systemwide fonts
Redesigned Spotlight, front and center with interactive previews and search results
Family Sharing
Continuity
OS X Yosemite Continuity

Send and receive calls on your iPhone using your Mac
Handoff — start a task on one device and finish it on another
Instant Hotspot
Safari
Safari OS X Yosemite

Private Mode — private web browsing like incognito mode on Chrome
Streamlined toolbar, including a Tab View button
The top-left green button is now for entering full-screen mode
Improved and faster Nitro JavaScript engine
Favorites view — a drop-down menu in the smart search bar
Tab view — shows all of your tabs on one page
Search tabs by URL or a term in the article name
Spotlight Suggestions — based on Wikipedia, Maps, news, search engines and other sources
DuckDuckGo search engine support
Support for the latest web standards, including WebGL
Improved social sharing options
Mail
Mail OS X Yosemite

Mail Drop — for sending large attachments up to 5 GB per message
Mark up attachments within the app, such as PDFs or forms
Streamlined toolbar
Messages
Messages for OS X Yosemite

Record and send audio clip messages
Send and receive SMS and MMS messages when your iPhone is nearby your Mac
Name group conversations
Add or remove participants to group conversations
Leave a group conversation
Finder
Finder OS X Yosemite

iCloud Drive
AirDrop between iOS and Mac
Streamlined toolbar
Developer Tools
Swift

Swift programming language
Xcode 6
SpriteKit
SceneKit
CloudKit
Improved game controller support
Shared frameworks between OS X and iOS
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New IOS 8 features. . .
Recived/ Make phone calls on Ipad / I Mac

Snapchats right in Messages


Battery usage by app
Per tab private browsing in Safari

Wi-Fi calling

Time-lapse mode in Camera

Tips app

In Case of Emergency card


Hey Siri always-on recognition

Accessibility
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Along with these features, Apple has also greatly improved accessibility features in iOS 8:
Alex voice
Braille keyboard
Multi-device support for MFi hearing aids
Guided Access improved with option for time limits, countdown timer and Touch ID support
Improved zoom
Unknown features
There were a lot of features that got a one line mention, but we don't know what they really are:
Speak Screen
Place cards in other apps
Instant burst mode
Other tidbits
Other tidbits from iOS 8 include:
FaceTime call waiting
Use Siri to purchase iTunes content
Rich text-editing in Notes
RSS feeds in shared links in Safari
24 new direction languages
iBooks is now built into iOS
Automatic night mode in iBooks
Camera timer
DuckDuckGo support in Safari
An option to use the last photo taken when importing photos
Panorama on iPad too





credit video: www.apple.com