Following a PC release last week, Skyrim Special Edition update 1.04 (aka Update 1.2) is now live on PlayStation 4, Bethesda has announced. The Xbox One version of the update is expected later this week.
Here’s what changed with today’s Skyrim Special Edition update on PS4, which is 477MB:

General stability and performance improvements
Fixed issue with water flow not rendering properly
Fixed crash related to changing from werewolf back to human form
Fixed crash related to reloading after changing Load Order of mods
General bug fixing and improvements with browsing Mods

In the Known Issues section on Bethesda’s website, they explain what to do if you get stuck in the world:
There are some obscure areas where you can accidentally get stuck in the level geometry and be rendered unable to escape by normal means. On all platforms, if you are outdoors, you can attempt to Fast Travel elsewhere via your World Map. This will not be possible if there are enemies nearby. If you are indoors or otherwise in an area or situation where you cannot Fast Travel, you will have to reload a previous save and be wary of the area in the future.
Bethesda also explained how to access the Dawnguard, Dragonborn, and Hearthfire expansion content:
Dawnguard
Once Dawnguard is installed, players that are level 10 or higher will hear rumors about the Dawnguard from guards in major cities. They may also be approached by a courier who will give them a note about the Dawnguard....