We showed this to business partners last month and we are about to deliver the new tooling in a post Notes 8.5 web delivery in time for Lotusphere. So you will be able to do most of this stuff at Lotusphere. The goal is to get these new component containers into the Notes 8.5.1 release.
I demonstrate creating a new composite application where I configure the components (properties and actions) right from within the composite application editor. The three components are a web browser form, a Notes Java View, and a Symphony spreadsheet. The new tooling shows as a toolbar right within the component while editing in the CAE.