Apple is allegedly prepared to add a new thin-and-light 15-inch MacBook to its lineup in the near future, with one report claiming the company has finished development of a crucial test component.

Calling the new notebook model an extension of the MacBook Air family, Macotakara reported on Sunday that Apple is finishing up a "test phase" for the new 15-inch ultraportable. Citing an Asian source, the report said Apple has already finished development of an LCD test component for the anticipated notebook.

However, the report also noted that Apple is believed to be developing a next-generation MacBook Pro that will not have a built-in optical disc drive. The new 15-inch MacBook reportedly "seems to fill" the role of a next-generation MacBook Pro.

Whatever name the new portable Mac might take, rumors have suggested the current physical form factor of the MacBook Pro lineup will undergo a drastic redesign in 2012. For some time now it has been said that Apple will redesign its MacBook Pro lineup sometime next year.

Last week, Apple quietly updated its MacBook Pro lineup, adding slightly faster Intel Sandy Bridge processors, as well as improved AMD Radeon graphics. The new notebooks were a minor update ahead of the holiday buying season, believed to be an attempt to keep the MacBook Pro lineup competitive until a major refresh occurs next year.

Apple's future MacBooks are expected to feature Intel's next-generation Ivy Bridge processors, which are slated to arrive at some point in the first half of 2012. Intel confirmed last week that it has begun volume production of its 22nm Ivy Bridge processors, and systems powered by the new CPUs should be available in the spring of 2012.