Rolling under the same model number (SM-G920), the specs sheet of the phone is most probably indiscernible from the regular Galaxy S6, except for the two SIM slots, of course. It still comes with a 5.1-inch Quad HD display, an octa-core Exynos 7420 chipset, 3 GB of RAM, and a 16 MP rear-positioned shooter with an aperture of f/1.9.
As far as pricing is concerned, the dual-SIM Galaxy S6 rendition with 64GB of storage is commanding a RUB 52,990 price tag (~$901). There is no information whether it will be available in 32 and 128 GB versions. too. While nothing is official on whether the Galaxy S6 Duos will be available in select markets only, that will probably be the case, as usual.