Our guess is that the buildup to this Tuesday's iPhone OS 3.0 Preview will be filled with rumors, new and old. Speaking of old, Wired has just dusted off the Premium App Store (or App Store Plus) story from back in January. While that story focused on Premium Games, and Wired re-enforces that focus, they all suggest there could be a wider range of content:

This "velvet rope" section of Apple's store could feature software programs that cost $20 or more, making it friendlier to publishers whose products are too complicated to be created in one developer's spare time. That change would make the App Store more friendly to game publishers, as well as enterprise software companies such as SAP that would otherwise prefer to focus on the more business-user targeted BlackBerry phones. BlackBerry is expected to launch its own app store, called the BlackBerry App World, later this month.

I would pay $20+ for an app that was worth $20+, and if separating those apps off from the $0.99 fartsnjiggles crowd helps developers pay their bills while making what we hope are the Next Great Apps, more power to them.

The question then becomes, what's worth $20+ to you in an iPhone App?