How to update your Raspberry Pi with the new September 2014 release.

You can update the system and packages with

sudo apt-get update
sudo apt-get upgrade
sudo rpi-update

This will update your kernel and all the packages you have installed. For example if your image had Sonic Pi v1 installed, the package will be updated to v2.

For packages which are new to the image, like Minecraft and the browser, you’ll have to explicitly install them, e.g.

sudo apt-get install minecraft-pi
sudo apt-get install epiphany-browser

Thanks to Ben Nuttall.
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