The WiFi only SM-T820 model and the 4G LTE-capable SM-T825 surfaced on FCC, but the launch date of the Galaxy Tab S3 surfaced online. Reports from South Korea reveal that Samsung plans to unveil it on February 26 at MWC.
http://www.notebookcheck.net/Samsung-Galaxy-Tab-S3-arrives-at-FCC.194858.0.html