Vietnamese site Tinhte, the same site that leaked video of the next iPhone a few days ago, has published pictures and specs of the next MacBook. On the outside, the new MacBook appears identical to what's currently being sold, with a plastic unibody enclosure and a 13.3" LED-backlit display. Internally, the only changes made to the upcoming MacBook are the introduction of a 2.4 GHz Intel Core 2 Duo CPU and an NVIDIA GeForce 320M GPU. This is the same CPU/GPU set used in the baseline 13" MacBook Pro. For comparison, the currently shipping MacBook has a 2.26 GHz Intel Core 2 Duo CPU and an NVIDIA GeForce 9400M GPU.
All other specs remain the same; the MacBook still has a 250 GB 5400 RPM hard drive and 2 GB of RAM. Based on markings on the side of the box, battery performance appears to be unchanged, with the same 7-hour performance as the currently shipping MacBook.
In all, this appears to be a relatively modest update. The larger question is how these Vietnamese sites keep getting pre-released Apple products. Based on Vietnam's proximity to the Chinese factories where these products are built, it seems likely Apple has a factory leak on its hands. It's also worth noting that this new MacBook may be the product referenced by number MC516LL/A K87 BETTER BTR-USA. Last week we thought this product number referred to an upcoming MacBook Air update, but based on this newest leak, it seems the MacBook is a far more likely suspect.
MacRumors cites "reseller reports" and says this new MacBook may ship as early as next week.