Yes, Samsung smetimes release dual Sim version of phones but only on more exotic markets so they’re hard to reach for most of us.
So what this is about? SIMore made na dual SIM adapter for Samsung Galaxy S7 and S7 EDGE.
Any problems? Yes, two: second SIM card hangs loose (so better buy a case) and to switch between cards phone restart is inevitable.
But both cards are fully functional.
Adapter should be avaible from September 26th for EUR 49.

Source: gsmManiaK (polish)