Video frames may decode quicker, but they'll still play back at the same 24 fps. Right now all of our tests are fixed workloads: web pages may render quicker, but you'll still be idle for the same amount of time regardless of system. The only scenario our battery life tests don't duplicate is one where workload scales with performance. Core 2 was a pretty low power architecture, beating its battery life will be difficult. Heavy usage cases however can easily be worse than last year's model, specifically with the 15 and 17-inch systems. On top of that, Sandy Bridge is a very efficient microarchitecture that manages to get work done quicker than Arrandale and get to sleep faster. Apple makes up for the higher core count of the 15-inch MBP by capping turbo speeds and being very good about allowing the CPU to go into deep sleep states under OS X. In reality it breaks down like this: light usage cases are equal if not better than last year's model. With the potential for higher power draw, battery life on these new systems has the chance to be really, really bad.
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