After a long time Apple will unveil a new Mac ultra portable notebook at the Macworld Expo and Conference in January. AppleInsider has leaked the info on the new machine which is about 50 percent lighter and strikingly slimmer than the company's current 15-inch professional MacBook Pro. In an effort to slim down the notebook, Apple has decided to omit optical drive from the system.

It's expected to feature solid state disk (for much needed energy efficiency and instantaneous boot time), and backlit LED.

Source