During a livestream on Twitch, Naughty Dog revealed quite a few elements about the upcoming Survival update for Uncharted 4: A Thief's End, which will be released tomorrow for everyone who purchased the game.

The patch will be a whopping 3.7 gigabytes, so you better prepare for a relatively long download depending on your downstream speeds.

The download size is certainly justified, since it will come with a lot of content, including the new survival co-op mode in five different difficulties, easy, moderate, hard, crushing and hardcore. It will include "RPG elements" with character progression, but the difficulty of the enemies also scales up with each wave.

If you wipe in hardcore mode, it's game over. Completion times are stored on the servers, so Naughty Dog expects players to start competing for the fastest times.

Relics will be awarded in co-op by completing stages, and will be earned at a comparable rate compared to competitive modes. The longer you spend in a co-op match, the more relics you will earn. You will receive relics if you play survival mode all by yourself as well.

A new "King of the Hill" PvP game mode will also enter public testing, and two maps will be added, "Train Wreck" and "Prison."

New skins and customization items will be added, including unlocks for the new level cap, at level 80 and 90 (respectively a bloody and a wraith version of the Djinn Skull headgear). Co-op progression will be separate, and you will start from level 1 in the new mode.

New music and weapons will also be included from previous chapters of the Uncharted series, and each multiplayer skin will get 25 new selectable color combinations.

If you want to see the mode in action, you can check out a video, and a few screenshots released at PlayStation Experience.