It looks a little different, allows for split screen multitasking by long pressing the select button, notifications can be bundled, and it appears there’s a better dismiss all option for notifications (but I may be imagining that last one).
I don’t have a lot of playtime on it yet, but the split screen is actually quite useful for trying to look up something to correct your horribly racist friend.
On my Nexus 9 I simply signed up for the Android Beta program above, and a few minutes later an OTA notification was in my status bar. It downloaded, took about 15 minutes to install, and bam.
Being in the first 24 hours of using it I really can’t comment on anything other than that it’s working.
There is no codename listed for N, but it’s probably Nutella or NERDS given they’re both awesome.
[Ars Technica]