Price: $200 or more. - The DSi XL sold for about $180 at launch, and it was just a larger version of the DSi. It has been proven to be just about as powerful as the Gamecube/Wii just by the screenshots for games like Kid Icarus, and other stuff like the 3D I'm sure will not be that cheap since it's somewhat recent technology. Besides that, I don’t know what else could make the 3DS priced at around $200 or more, but the Gamecube/Wii hardware and the 3D will most likely be the main reason for it.
Release Date: Late 2010 or early 2011. - Nintendo said that the current 3DS is not the final design and since Nintendo is about trying to cater to as much people as possible, they will probably wait until the sales of the DSi brand slows down and/or the price for the technology required for the 3DS goes down.