There are a lot more options you'll find as you explore. Like:

Viewing threads: You now can CHOOSE how you view threads. How we are used to viewing them is called Linear Mode
You also now have a choice called Threaded Mode which just shows you the beginning line of each post, and you click on it to see the contents of that post. This should be valuable to people with smaller screens - like when using a handheld device, or people with slower connection, like dial-up, as it only has to load a fraction of the information at a time. There's also a hybrid of the two modes.

To Change Viewing Modes when you are in a thread, the top left choice in the darker blue bar is "Display Modes" Click that text, and you'll see the choices.