I just mean that we dont have good amounts of them in the wild to gauge how well they will work / thermals / etc. Yes the new processors will have advantages that the old ones dont, but they might also have disadvantages due to those higher clocks, extra cores, etc.
I needed a new laptop now, they are not readily available, seemed like the right call.
Back to the original posters question: If you need something now and the 7577 is available. I recommend. If you can wait for reviews, then look at the new model.