I am a little late announcing this, but Season three is now available on Amazon (see link below). On the side bar, I have added a link to all episodes of Hollywood vs. Historical. I have got a few emails asking if I am going to be doing another Hollywood vs. Historical for season four. It really depends on if I can get my hands on a few episodes before they are released. It is just too hard to keep up with the research unless I see the episodes a few weeks before they are aired. (yes, that was a hint to the good folks at Showtime.)
There are some spoilers for season four over at the Tudor wiki.