Well there definitely weren't any when Kubrick last had anything to do with it. Just don't let Spielberg loose on it, or we'll probably get digitalised tanks, planes and who knows what else.
I can't say I remember any tanks in this movie, though it's been a couple years since I've watched it and, since I'm in the middle of a move, can't pull it out to look. Sorry!
Wait a minute, I just saw A Very Long Engagement about a month ago...that might have had a shot or two of a tank. Not sure, though. And, uh, it's not on DVD yet, so I guess that's not entirely helpful.
I believe some vintage tanks were used in "The Battle of the Bulge" and in a couple of shots of "Patton." It always cracks me up when you see a Korean war "Patton" tank or an M60 in WWII films.