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Talk into your Mac or external microphone and it will transcribe your voice for you. Just be careful: everything you speak will be uploaded to Apple for processing. It also means if you're on a mobile broadband connection, one should be careful as to not incur excessive data costs.
The Mac App Store now includes operating system updates, such as required software patches. These come from Apple directly, while other applications -- such as those that you have bought -- also appear here. It's an all-in-one center for all of your apps and updates.
Messages is a new application that stores all of your iMessages and text messages on your iPhone or iPad. You can take a photo from your iPhone, send it, and see replies on your Mac. You can also send location data and photos.