I'm going to say this some kind of new Kroot model. The digits look zygodactylous (two forward and two back, like chameleons and some birds). The Kroot have a similar arrangement. Also the heavy stitching on the underside of the gauntlet is a common Kroot aesthetic. The amount of detail on the painting implies that it's really big though. And the nails are more rounded than the normal Kroot. Maybe a new Krootox, or some other kind of big boy Kroot model.
The Farstalker Kinband box can be used to assemble Carnivores (I think) and it comes with a few Hounds. So a new Krootox would nearly finish refreshing the existing Kroot range in plastic. Maybe they'll be a small-sized squad of 3 models instead of a solo or unit upgrade.
The previous Tau Codex made a point of including rules for fielding an all-Kroot force. The optimist in me hopes that they're going to add a few more units to the Kroot subfaction to round it out. Be a good use of Detachment rules in the new list-building for 10e. New Tau Codex is slated for Spring 2024. I'm gonna start huffing that copium for a Kroot Mercenaries Detachment. I mean, they already did Squats, anything is possible.