3. Osbourne effect avoided by not crowing about specs - those who are cautious or dependent on x86 will continue buying Intel kit. Once the new product is available and it kicks the daylight out of the legacy, they will already have their pareto-split of interest in their new offerings.
It makes sense that they wouldn't:
1. Its dev hardware, not final production hardware. They'll want to compare the A13 or A14 (or whatever SoC they finally use) for benchmarks.
2. Until the apps are optimized, it doesn't make sense for Apple to put itself in the position of bad press with premature figures.