Apple Insider picked up a rumor that Apple may be working on a 15" MacBook Air model:
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.