Bungie is really billing Destiny Year Two, which kicks off with the latest expansion The Taken King, as a bit of a game changer. Starting at 11am Pacific (2pm EST), the team behind the game are going to livestream much of the changes and improvements being rolled out, including the new leveling and light systems as well as the changes to the Tower. The livestream will be hosted by Deej, the Bungie Community Manager, and feature Executive Producer Mark Noseworthy and Senior Design Lead Tyson Green. You can find it on Bungie's twitch channel: http://www.twitch.tv/bungie
There's also this reveal trailer, that touches on some of the aspects they will be talking about and features the voice of Nathan Fillion. Now you'll have to excuse me while I go off and reminisce some about Firefly...