According to news published today in Engadget, a version of the Kohjinsha UMPC with an optical drive will be released at the end of this month.
this 7-incher includes a full-fledged dual-layer DVD writer, which tags along nicely with the 1,024 x 600 resolution LED-backlit panel, 1.3-megapixel camera, 60GB hard drive, 802.11b/g WiFi, Bluetooth and 800MHz A110 processor. It's also filled with 1GB of DDR2 RAM, Ethernet, a duo of USB 2.0 ports, VGA output, audio in / out, 3-in-1 multicard reader and a pair of battery options promising 3.5 / 7.2 hours of life. The 2.4-pound machine looks to be available at the end of this month.
The Kohjinsha is a convertible UMPC that with all these options added weights around 2.4 pounds. 0.4 more than the initial concept for UMPC where the maximum weight should has been less than 2 pounds. Add to that the extended battery and probably will end close to 3 pounds. So... It's a matter of weight against options or functionality. Nobody is perfect. For myself I would go with anything less than 2 pounds. I do need the keyboard, the mouse, neither the DVD so why I should carry them fixed to my UMPC if I can have external ones attached in case I need any of them. To me UMPC is all about mobility and a key point in mobility is weight.