5/6/10 Update (10:20 a.m. PT): MovieTickets.com is reporting 842 sold-out showings for Iron Man 2, 255 of which are for midnight shows. Meanwhile, Fandango is reporting sold-out showings at specific locations such as NYC's AMC Loews Lincoln Square Cinemas (which has added a 3:10 a.m. Thursday night/Friday morning showtime), San Francisco's Metreon, Chicago's AMC Loews 600 North Michigan, and L.A.'s Universal CityWalk Cinemas.
5/5/10 Update: MovieTickets.com is reporting that Iron Man 2 currently has 810 sold-out showings. The Paramount release also accounts for 84 percent of daily sales on the ticketing site as of 10:30 a.m. PT.
4/28/10 Update: MovieTickets.com is reporting that Iron Man 2 is outselling Iron Man by a margin of 5 to 1 at the same point in the sales cycle.
4/21/10 Update: The rush of summer blockbusters will begin on May 7 with Iron Man 2, and it's bound kick things off with a bang.
MovieTickets.com is already reporting 49 sold-out showings for the Paramount release. Meanwhile, in a poll conducted on the site, 75 percent of moviegoers who are aware of the film plan on seeing it opening weekend.
The original Iron Man opened to $102.1 million in May 2008. BoxOffice.com is currently predicting a $145 million opening for the sequel.