Are any significant AI changes noticeable in 1.4 patch?
I haven't played too much into it, but the UK has been much more useful to me as France. They have troops in France now helping me push back those evil Germans, and with the help of some of their expeditionary forces, I have managed to bust out of occupied Italy and into Austria, reaching the outskirts of Vienna and managing to encircle Switzerland and link up with the Maginot Line.
This could be a result of continuing my save, but the US has still not done much. When I first loaded the game, their mega-stack in San Francisco started to spread around. I was hoping they would at least invade the Axis players in South Amerca, or maybe even take on the Japanese and free my colony in Indochina. No such luck. They've only taken a few minor islands, and they have stopped. San Francisco has 1200 or so infantry brigades standing by, but they only have a whopping 12 transports. Australia has actually made moves now, though, so that's a plus. There is also an Iraqi division in London, which I thought was great.
EDIT: I should also say that the Axis minor states have sent much more in the way of assistance to the front in Austria. Before, only the Greeks and the Yugoslavian forces actually were there, but now there is a nice sized Hungarian contingent. The AI seems to be doing better in this area.