Yes I do think they have become more outwardly zionist and I would say that is because the demographic they reach (normal Jews who aren't necessarily orthodox or haredi, but interested in increasing observance, strengthening Jewish identity) - these people naturally identify with basic Jewish sentiments like nationalism/zionism, the state of Israel, dislike of muslim nazi terrorist enemies, etc. Because they haven't been brainwashed in any system to reject that stuff, so it comes naturally, or if they were caught in the reform 'liberal pro arab' trap, they escaped that to now want to be more observant authentically and to learn from aish. I also think the people who do kiruv are more inclined toward these views or at least more open to them. If they were completely antizionist or very weak/uncertain "nonzionist" people would reject aish more and be turned off by it a lot more.
Like the articles muman has posted here, I've seen some pretty good articles from aish as well stressing the Jewish people's ownership of eretz yisrael etc. And I think that they take that approach which is different somewhat from haredi and even from their own aish "rebbe" because that is what upward striving Jews are looking for and that will produce success for their organization. Over time the aish organization will probably (if they haven't already) come to see these views as 'their own' and adopt them more fully in themselves aside from just appealing to the masses with it as a kiruv 'tactic' so to speak.