HitFix has an article about the very thing we've been talking about in here:
Highly relevant quote from earlier:
Looks very likely to open in the same general range as The Avengers. Its legs should be at least nearly as good, though Avengers had tremendous word of mouth, so it's hard to imagine improving on that much.
The key difference will be in regards to 3D ticket prices. While "Dark Knight Rises" will use IMAX screens to help boost its grosses and may actually sell more IMAX tickets than "The Avengers" did over its opening frame, the Marvel release had the benefit of higher 3D ticket prices. "Rises" will only be available on conventional screens and in IMAX. That may be the difference in determining whether "Rises" can overtake "Avengers" for the biggest opening weekend record.
Right now, tracking services conservatively see "The Dark Knight Rises," which hits theaters on July 20, as opening between $150-170 million over the three-day frame. However, there is a collective opinion that after the July 4th weekend ... that the numbers will indicate ah opening closer to $200 million. ... First Choice, a key indicator of moviegoer interest, is pretty much the same as "The Avengers," but the Warner Bros. feature is slightly behind in a few other key indicators. However, when interest level is this high it's easy to make the argument "Rises" is as anticipated as Marvel's global blockbuster was.