That is the justification that helped me make my purchase. I already had a C2D iMac with a 9400M processor. I didn't think I needed to computers with the same type of everything. It didn't hurt that the update gave it 4GB over the previous 2GB RAM.
Yeah, no doubt...my justification was, and I suppose, if in a week no 13-inch MBP upgrade is announced or out, this may be marginally beneficial to those on the fence:
1) Considerably better graphics, at least according to benchmarks.
2) Anand forecasting that a next generation processor may not find its way into the next 13-MBP iteration, unless design is profoundly altered.
3) Furthermore, with Sandy Bridge on the horizon, Intel expected to ship at the end of this year with widespread assimilation in Q1 of 2011. Apple's next Macbook evolution could, very well, incorporate Sandy Bridge. With the GPU being on the same die as the CPU, Intel's integrated graphics would become acceptable, at least for mainstream use. Seems like a natural transition for Apple. It would free up much space and presumably make the computers more energy efficient. But I sat back and began to visualize the move. Intel's integrated graphics still won't match what NVIDIA and ATI offer and people here would then be vehemently clamoring for a discrete chip to match the previous generation. And I have no idea how that would work in a Sandy Bridge layout, with a hovering, intrusive GPU. Exactly how would one switch it off? This at least disillusioned me and made me reconsider holding out for Sandy Bridge. A lot of pundits dont feel it would be as revolutionary as Intel has made it out to be.
4) Since the Penryn technology has been around so long, Intel has had plenty of time to refine it. Systems, for example, run cooler than nascent 32nm technology (although take this with a grain of salt). Eventually 32nm will be more efficient and should run cooler, I guess.
5) Finally, even though the 13-inch model may seem like it was shafted, this refresh is one of the best Apple has ever had. The processor may be unnoticeably better than the previous generation, but the graphics are certainly a healthy step up, as is the battery life. Undeniably the larger models are more profoundly improved, but we lose sight of how nice a refresh this was for the 13-inch model, only b/c we compare it to the larger Macbooks. Well to some extent.