That's the standard way of bringing up Google Now--pressing and holding Home until you see an arc with the Google logo appear, then swiping up. The OP is asking about how on the N5 you can swipe from the left to bring in the Google Now page. It's specific to the N5 on KitKat. You can try to install it on other devices running KitKat (there are various articles that describe how to install the Google Experience Launcher, as mentioned by UJ95x), but I've read of various minor glitches when you install it on non-N5 devices.