You won't see > 16GB till cannon lake, probably some time in 2018. Kaby lake nor coffee lack support LPDDR4 and LPDDR3 is limited to 16GB. This is an Intel pro

You won't see > 16GB till cannon lake, probably some time in 2018. Kaby lake nor coffee lack support LPDDR4 and LPDDR3 is limited to 16GB. This is an Intel problem, not an Apple problem really, the only thing Apple could do about it is use DDR4L which would cut battery like quite a bit and require a whole new motherboard (and probably battery) design.