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.