As posted by Bigfoot, Klei's founder, right here, there's a new free content update coming to Don't Starve: Shipwrecked!
The new content is currently available under a new Steam Branch called "beta" with the password being "shipwreckedbeta". Got stumped and don't know how to access that? Here's a helpful link: http://support.kleientertainment.com/customer/portal/articles/2873712
So, what's new exactly?
Crockodogs. Will hound you at land and sea.