Just this past weekend at San Diego Comic Con 2009, James Cameron made the mega-announcement that August 21, 2009 would be Avatar Day, and that fans would be able to head out to participating IMAX theaters to see 15 whole minutes of glorious 3-D footage from the upcoming movie (Read: SDCC 09: See 15 Minutes of James Cameron’s “˜Avatar’ In 3D Imax For Free On August 21), which will be released on December 18, 2009. This gives movie-goers the chance to really see what the movie is all about and how it hopes to change the cinema experience as we presently know it.

Now comes details via a press release that there will indeed be a whole lot more to Avatar Day than just the 15-minute preview that was announced — in fact, a multitude of Avatar goodies are on the way on August 21!

For those of us who aren’t able to get our hands on tickets to the epic preview, the official trailer will in fact also be released on August 21. That’s right, every single one of us will be able to finally get a look at the movie, whether it’s in theaters on any type of screen, or even just online. Of course, it won’t look nearly as good on a little computer screen in 2-D, but it will give us a small idea of what to expect, in the very least.

Along with the trailer for the movie, the trailer for the video game from Ubisoft is going to be released, too. That’s not always the most exciting thing in the world due to the success of other movie-based video games; but the game is supposedly the first video game to be done in an immersive 3-D style. On top of all of that, Mattel will be putting out their Avatar action figures for all you movie toy collectors.

Details on how you can get into the 15-minute preview are expected to be announced very soon.

[Source: via /Film — click over to check out the full-size version of the image above!]