The Samsung Galaxy S4 has just been released in New York and CNET also have their first review up at http://reviews.cnet.com/samsung-galaxy-s4/.
There are some new photography/camera related features such as dual shot where you can take a photo at the same time with the front and rear facing cameras and then combine them into one "image", and drama shot that will combine all the actions from a burst shot (e.g. someone jumping) into a single shot.
Personally I am an iPhone fan and feel that a lot of the features, including the camera features, are a little gimmicky and wouldn't actually be all that useful but is interesting to see some of things Samsung are doing with their phones. It also looks rather large too with the 5" screen, it is funny to see how things have gone full circle and now phones are getting larger again!
Will be interesting to see how some of these new features actually work in practice as more reviews etc. start coming out.