Samsung has currently a lot of problems, but it looks like that is not affecting much other product releases. As rumoured before, the company plans to unveil and launch the Galaxy Tab S3 tablet series in the first quarter of 2017, thus in March the latest.
Two variants should be available, one with Wi-Fi connectivity only (model number SM-T820), and the second one with Wi-Fi + LTE support (model number SM-T825). Both should have 9.7-inch displays with 1536 x 2048 pixels resolution, and since the Galaxy Tab S2 series is widely available, expect the same from the Tab S3.