It will be interesting to see what gets updated if this comes out especially since an article on hardmac this morning seemed to think otherwise: (sorry if someone already posted this)
"With some delay over competitors, Apple updated part of its offer for notebooks, (re)creating performance gap between each products:
* Macbook Pro 15" and 17": important revision: powered by Core i5 or i7, Geforce GT 330M, HD display in option, ...
* Macbook Pro 13": almost no evolution, longer battery life time and slightly faster integrated chipset, but they remain powered by Core 2 Duo CPU, making the gap with their grand brother rather big now.
* MacBook Air: no revision, and probably no update in the near future.
So, we have now 3 types of products, really different in their design and performance, and this is most likely not entirely a choice made by Apple, but rather the consequence of other external factors (financial and technology):
1. Moving to Core iX CPU will require to have a dedicated GPU, as Intel integrated chipset are far being the current NVIDIA GF 9400 M powering the MacBook and some older MBP models. In addition, such discrete GPU would need some dedicated space on the motherboard, something not necessarily easy to find on a 13" model.
2. Heat management is another challenge. For now years, Apple was installing a single fan to eject the heat outside of the enclosure, this was also true for the older MBP 15" model based on a GF 9400M without any discrete GPU. So, discrete GPU = 2 fans
3. The MBP 13" and the MBA are both small enclosure hardware, requiring smaller battery, so potentially reducing lifetime of usage if components are draining too much energy.
The latest point is especially of concern for the MBA, and this is most likely the reason why it did not evolve much for now months. To expect any important improvements, Apple will have to wait for new hardware solutions, probably with the release of Intel Sandy Bridge, its future mobile architecture, the only solution to get Core iX in MBP 13" and MBA. It is still unclear if the integrated chipset will have evolved enough to be able to compete with the three-years old GF 9400 M.
In conclusion, Intel is probably the main responsible factor for the lack of evolution for this 2 products. By preventing NVIDIA to develop competitive chipset for its current mobile platform, Intel prevented Apple to look for true alternative for the Core iX-based hardware. this could well be the reason why the relationship between Apple and Intel re not as warm as 2 years ago."