Scawen is known to be working hard still on tyre physics. He might not be putting in the big hours he did at the start of this project, but then why should he? It's clearly not ideal to go so long without an update, but Scawen is commited to tyres, and at least when it's updated, he hopefully won't have to go back to it for a long time.
What I find more worrying is why we couldn't of had at least content patches in the meantime. Sure Rockingham, Scirocco and other surprises have to wait, but the existing models and textures could have been polished to a shine by now. So the question is either, why couldn't they be released, or why haven't they been done? We've had nice updates to tracks and interiors before, why can't we again to tide over the community until Scawen has something for us?