Our objective for Agenda is what you already see now: a note taker with a focus on projects and dates. We will add features as we go, but the core is already there. You can already see what it is and decide if it is for you.
It will never be a task manager like Things or OmniFocus. It has some overlap (lists etc), but it will never match those apps feature-for-feature. You either have to find a way to integrate Agenda with those apps, or adapt whatever system you have been using so that it fits better with the freeform note taking approach that Agenda has.