[dingo_bat]

It's almost certain to retain the memory card slot, just like all Galaxy phones.

[adrr]

Galaxy s6 doesn't have a memory card slot not sure about other galaxy phones.

[cbg0]

S7 and S8 have it.

[dragonwriter]

Memory card slot was restored in the S7/Note7 generation and retained in the subsequent one; keeping/restoring features other manufacturers are eliminating seems to be a key differentiating aspect of the Samsung flagship line.