Did you see the actual images? The image of the first one says it was filed back in in November, 2000. It was approved in August 2003. It looks like they're outlining the GameCube's schematics... or a patent in how add-ons interface with the GameCube. The mass storage media, modem, network, flash memory, etc. are theoretical in the architecture. The same graph appears in several of their more recent patents.
Second one was filed back in 1999, approved in July '03. This is the 64DD patent itself. If you check the images, you'll see an artist drawing of the DD and the N64.
It doesn't look like these are nuggets that will help us figure out their new product, but every now and then I look at their patents too. It's fun the see the stuff they were doing that never came to fruition. The SNES CD is in there somewhere too.