If you see the case being relisted multiple times for multiple conferences, after the response is filed, then I’d start to be concerned. Right now, it just means it caught at least one justice’s eye and they’d like a response. There could be reasons beyond the merits to deny review, such as being a poor vehicle to address the issue, even if it could garner interest of four justices. Wait for the response and what happens or doesn’t happen then. Better things to be nervous about today.