The new version of the software is available to download from the
USMLE website. It includes an entire extra block of questions that has audio/video media clips and the new "sequential" type questions that they are introducing in 2009. They also added a calculator to use.
I only went through the tutorial but it seems like those sequential questions are not all that bad. You have to answer the first one before you can see the next question. The first question gets locked so you can't go back to change your answer. I think this is because the 2nd question probably gives the first one away. In the tutorial it was set up like this: Stem, Q1 What is the most likely diagnosis?, Q2 Patient ended up having [answer to 1st Q], what would be best treatment?
I bet these will all be experimental at first. They're good types of questions though.