MacScoop claims that “trusted sources” have passed on information that Apple is planning to release “a notebook that is so small and light that it could redefine the standards of ultra-portable computing.”

The site claims that the new notebook will most likely complete the MacBook Pro line-up, featuring a 12-inch display and be “half as thick” as the original 12-inch PowerBook (somewhere between 15-18 mm or 0.6-0.7 inches).

The new notebook will reportedly be Apple’s lightest ever, weighing in at less than 1.3KG (3 pounds), compare that to the 2.44KG (5.4 pounds) of the current 15-inch MacBook Pro.

MacScoop notes that their source neglected to include any information about an optical drive, which leads the site to speculate that there simply is no drive thin enough. But does report that a new drive unleashed earlier in the year by Panasonic is just 6.8mm (0.27 inches) thick.

Release timeframes are said to be “vague” but tracking before the end of 2007.