We reported a few weeks back that Samsung has developed two new handsets with model numbers SM-G928S and SM-N920F, with the former being a new variant of the Galaxy S6 because the model number made it clear that it's a derivative for an existing model rather than a completely new one. The list of model numbers for the SM-G928 that we received showed that this variant would at least be released in the United States, South Korea and a few markets in Europe.
The latest data from import tracker Zauba shows that a “sample Samsung mobile phone set” with model number SM-G929F has been imported to India for the purpose of evaluation and testing. This isn't unusual as many unreleased Samsung devices first get imported to the country for testing before they're made official. From the looks of it this is variant similar to the SM-G928S, and it's unclear at this point in time when Samsung intends to launch this variant of the Galaxy S6.
Thanks Arthur!