Nintendo unveiled its new DSi portable game system Wednesday in Japan. The revamped portable game console reportedly sports a larger screen; not one, but two 3-megapixel cameras, and an audio player. The DSi replaces Nintendo’s very popular DS and joins the DS Lite, the company’s other handheld gaming device. The DSi is 12 percent slimmer than its predecessor. It features storage as well as an SD card slot for expandable memory when downloading content from the Nintendo DS Ware shop.