APPLE INSIDER
A future MacBook Pro may have keys that could be used as a touchpad, with the same technology possible for use in a design where there’s no dedicated touchpad section at all.
MacBook Pro trackpad and keyboard. One of the more tricky areas of designing a notebook computer lies in the relationship between the areas set aside for the keyboard and the trackpad. A large keyboard may be comfortable for the user to use, but it could leave little room for the manufacturer to place the trackpad.
Source: APPLE INSIDER