There have been some rumblings about this in the past, but now we know that it's true. The Astro Boy movie will be released in 3D!
If you have the special glasses, you can watch a trailer on YouTube. Notice the "Coming Soon in 3D" text that sets this trailer apart from previous ones.
You can read more about the 3D version of Astro Boy here and download the trailer for yourself (3D video player required). Informatuion about 3D Blu Ray home theaters can be found here. Big time thanks to Lisa Sapphire for sending me these links!