The app, innocuously labeled "vzw htcbolt device showcase", is meant to demonstrate things like on-board apps, Google services, device speed, and the 4G network. And while we don't think this means the ThunderBolt is coming out tomorrow, we do think this is a sign that they're putting their ducks in a row, preceding its availability.
Interestingly, there is no mention of Skype with video on the showcase. They mention video chatting capability with its front-facing camera. But we figure if they had Skype video support, they would definitely want to flaunt it. So to reiterate: this doesn't mean the ThunderBolt is ready to roll, but it does mean we're getting closer.
source: Android Market via Android Life