since all foreign versions are dubbed and Americans hate reading subtitles .
No, not all of them are dubbed. Plus there's the UK & Australia where it's already out.
Anyway, as of yesterday there is one version out with Russian sound. I'm sure it won't take longer than a day or two for English sound copies.
Imo the best reason that IM2 won't be affected by piracy this early is that nobody wants to see such a movie (effects, battles and all that) in a crappy cam version, on a small screen. Maybe they would have a problem if a dvd/blu-ray quality copy was out there.
Plus the fact that it has become one of those must see, exciting, fun events.