I guess Corona Cards was the secret front burner project. It could be a way for CL to make new customers out of native developers who have never used Corona, though I suspect most of the devs it will entice are current Corona users who are also experienced native developers, and perhaps former Corona users who jumped ship due to the SDKs limitations. But those are small pools of potential customers for this new product. For people like me, who develop only in Corona and don’t (or can’t) develop natively, Corona Cards doesn’t appear to provide anything I can use.
The plugin marketplace, on the other hand, promises to bring much new and needed functionality to CoronaSDK over what I and CL are capable of delivering. From my perspective this would improve the quality and functionality of the SDK, would free up CLs’ developers to focus more on core functionality and bug fixing which would, again, improve the quality of Corona SDK and thus drive more developers to consider using CoronaSDK in the first place. CL would also retain more existing customers who would otherwise jump ship, and could also stand to gain new Enterprise customers who would be interested in putting their expertise to work selling plugins to people like me. Win-win-win.