With the release of unibody laptops, everything seemed to point to the disappearance of the white polycarbonate model, but in the end everything indicates that Apple has different plans for its cheapest laptop of all.
Apple's plans, always according to this rumor, are based on aesthetically renewing the white MacBook, keeping the polycarbonate structure and improving its internal components, to sell it safely for under 1000 dollars.
A cheap option to have a Mac, but it is worth stretching a little and getting a Unibody, that without a doubt.
Source | AppleWeblog