It should do just fine overseas, The Dark Knight pulled in $468.5 million in the foreign market and that is without IMAX tickets. Everybody knows Batman, arguably the most popular comic book character.
A couple of quick thoughts on the film:
1. I highly recommend it to anyone.
2. The acting is once again superb, especially for a movie licensed from a comic book. I did find Bane's "Masterpiece Theater" voice to be odd but in no way does it detract from Tom Hardy's portrayal, believe it or not and I got over it quickly. Anne Hathaway is more than eye candy, she gave what is by far the best portrayal of Catwoman on film period. Eartha Kitt, Julie Newmar, Michelle Pfeiffer etc. pale in comparison. The plot is very engaging, sucks you right into Gotham City. It was cool to see cameos from past villians, but when you did you couldn't help but think how cool it would be to see Heath Ledger's Joker. I don't want to spoil anything but there are lots of goodies to be had here.
I also saw a couple of trailers that caught my eye: one for a remake or reboot of Wizard of Oz by Disney (which, much like the Stooges movie no one was asking for) and Christopher Nolan's next project: Man of Steel. Yep, he's going from Bats to Supes and I for one will be interested to see what Nolan can do with Mr. Kent.
Almost forgot, you can't go wrong with either movie. Although they are both comic book movies they are very different from one another and that makes it hard to pick a favorite. I will probably have to watch them back to back when I get a chance to give a final verdict.