http://www.gsmarena.com/android_n_feature_overview-news-1715…
Some new, very cool features have been implemented this time round.
What's new:
RemoteInput notification API allows you to reply to messages within the notification shade
Quick power toggles / settings on the notification bar
Split-screen multitasking
Improved Doze and Project Svelte — no more wakelocks even if your phone is being carried in your pocket
New settings layout
Night mode! (makes screen warmer for easier night viewing)
Super-fast application update or installs — what used to take minutes now takes seconds..
Data saver — lowers data usage using methods like bitrate lowering or reduced quality image downloading
Apps can check if the user has enabled Data saver and make an effort to limit data usage
Number blocking and call screening
New languages added
Android TV recording with Timeshifting API's
Always On VPN
Improved boot time with Direct boot
New and improved accessibility settings
Like the bleeding edge? Nexus users can test out the preview
https://developer.android.com/preview/download.html
and once i put back/restore my nova backup, all will feel the same as before (kitkat/lolli) :D