The previews keep recycling old assets. To this day I have barely seen a new asset in 1.5 years of previews (possibly none). This is, by far, the biggest indication that there are no plans to continue this other than to milk fools. Think about even the devs who are barely starting: the first thing they do to advertise new updates is to showcase new assets or new environments. This guy has shown nothing.
Ask any dev worth his salt, what they would do if they received 10k per month for 1.5 years. Wouldn't they invest and buy at least a few assets? you will hardly find one that will tell you no. It's a no brainer, as it pays-off quite well as they help you advertise the game and create more diverse scenes in the future. Here, instead, you get close-ups of poorly textured walls or skin as "previews".
It's very suspicious.