First the Galaxy S6, now it looks pretty certain that the upcoming Xperia Z4 will be dropping the SD slot as a consequence of Sony shaving another 1mm of thickness.
I have the Z2 and an Xperia Z tablet and I love the ability to be able to swap an SD between devices.
I discounted the S6 earlier this week for their decision to drop the SD. It looks like I will have to accept my days of porting music and video between devices may fast be coming to an end.
(Yes the new M9 retains it ... but HTC Sense? No thanks).