Interesting. Do you want to elaborate more on that?
Of course. Here is the exact same frame from the theatrical version (HDTV), compared to the Blu-Ray (at 00.09.56) : http://www.framecompare.com/image-compare/screenshotcomparison/1B01NNNU
I only stretched and warped the HDTV version to fit perfectly the BR.
As you can see, some ships are in the same place, some are not, some are added… Obviously, the entire scene was rerendered for the Blu-Ray (possibly for the same reason than adding a bridge near the Palace of Theed…).