On the Zauba site, the SM-G906K was listed as having been shipped into the country for R&D purposes. Samsung sent four units into India, each one valued at 30,527 Rupees ($504 USD). The SM-906S model number was recently spotted at the GFX benchmark site, revealing many of the high-end specs that are expected to be on the phone.
There is speculation that the SM-G906 is the Samsung Galaxy S5 Prime. Unlike the regular variant of the Samsung Galaxy S5, this model will feature a metal casing, a 1440 x 2560 QHD resolution screen, a Snapdragon 805 processor, and 3GB of RAM. The latest rumor has Samsung unveiling the phone as soon as next month. The SM-906K is a model for Korea Telecom, while the SM-906S should be headed to SK Telecom.
source: Zauba, GFX, Ubergizmo via BGR