Updated images are available for NOOBS (1.6.0) and Raspbian (2016-02-03). Existing system can simply be updated in place.
New distribution images have showed up on the Raspberry Pi Downloads page, for NOOBS 1.6.0 and Raspbian 2016-02-03. There has not been an official announcement yet (also known as a Raspberry Pi Blog post), but I assume one will come along very soon. The last time there was a delay between the release showing up in downloads and the actual announcement, it was because they were waiting for the Pi Zero announcement …
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