Imagine a DS-like cartridge that sticks out the back and has a larger top. It’s not that hard for anyone that makes or reviews games to imagine, as that’s pretty close to the ROMs that games devs use.
The thing is that the patent never comes out and says that this is a DS compliant cartridge. It could be for for a totally new system. DS2 anyone?
The application says that “the broken lines showing of an electronic game machine is for illustrative purposes only.” As you can see in the image in the gallery below, those broken lines look exactly like a Nintendo DS. Source Siliconera points out that the cart has the same number of pins as the old DS ones do.
Maybe it’s some kind of new add-on for current DS/DSi.