First, Apple is unlikely to revise the MacBook Pro when they've just done though three and a half months ago.
Second, these chips have worse graphics performance than what Apple is currently using, and it would be weird to switch to a chip that has faster CPU performance but worse GPU and GPGPU performance.
It's not impossible that they'll do it anyway, but it strikes me as unlikely.
Scenarios where the average user benefits from four cores over two do exist, but so do scenarios where they benefit from a beefier GPU. I'm not sure where you're drawing the 44% increase from, but on average, these are simply going to be slower than what Apple currently uses, unless they put in a separate dedicated GPU.