Ive been doing some research and Ive recently found out a lot of information as to what maybe the 3ds might look like, for example: height, weight, depth (long), wide, etc. So lets begin:

Height (Thin or thickness): The 3ds will be thicker (when closed)then the dsi but thinner than the dsi xl, with .80 inches.

Wideness: The 3ds will be less wider then the dsi xl and dsi with 5.3 inches.

Depth (longitude): The 3ds will be less taller when you stand it up on its long side then the dsi xl and dsi with 2.9 inches.

Top screen: The Top screen will be bigger then the dsis but smaller then the dsi xls with 3.53 in.

Bottom screen: The bottom screen will be smaller then both dsi and dsi xl screens with 3.02 inches.

Top screen resolution: The 3ds top screen resolution will be a whole lot better then both dsi, dsi xl, and even the psp go's screen resolution with an awesome 800 x 240. What this means is that the 3ds might have good enough graphics to rival with the psp franchise and even might be compared to wii graphics. psp go's resolution is 480 x 272 so i am surely convinced that the top screen quality of 3ds will be better then the psp's, and even when talking about graphics but dont get your hopes up to soon.

Bottom screen resolution: The 3ds's bottom screen resolution will be higher then both dsi and dsi xl's with a 320 x 240 resolution.

And at last the weight:

The 3ds will weigh 8oz meaning it will weigh more then a dsi but less then a dsi xl.

I hope you enjoyed reading this and found out more about the 3ds specifications and how it will look and feel like when it comes out. Since the final design of the 3ds is TBA(to be announced) i am not exactly sure the specifications in size will stay like this. If anything changes ill make sure to give you'll updated information, until then enjoy life and your Nintendo products.