It is a significant upgrade to the release version. In fact, with the completely new "1939 Storm over Europe" WW2 campaign, it is a free add-on in anything but name!
This patch includes all previous upgrades as well as entirely new bug fixes, and at least two new important improvements:
° Up to 50% faster AI
° New Paratroop intercept rule that allows enemy fighters to intercept your attempted Paratroop drops