Proof that the A12X wouldn't necessarily be a good choice for laptops
Just because it's good at web browsing benchmarks (which make use of Apple's very well optimized JS engine in Safari) and Geekbench doesn't mean it's good for everything, not to mention the issues with running x86 apps on an ARM CPU.
I honestly think it'd be more likely for Apple to make an X86 CPU than put an ARM one in a laptop in the recent future.