Apparently there is no plugin for QuickLook to view the .pvr files produced by the awesome PowerVR PVRTC tool. In fact, there isn’t any way to see the files on a Mac at all, other than a VM with either Linux or Windows (shame on you, PowerVR!).
Hence I’ve started to hack together a QuickLook plugin that does exactly that. I’m really busy at work at the moment, so it may take a while until it’s ready and up on github, but the project is already here: