Poll API and functionality is still planned. CB Activity just isn't currently the active project as I only really have time to focus completely on 1 project at a time outside of bug fixes and minor features for other projects.
Right now we're focusing on working on improving Joomlapolis itself to be easier and more user friendly to use. You'll notice all the product pages have been moved to a new platform (automated by CB Package Builder), but still need updated. Downloads page has significantly improved. Products menu replaced with simpler Memberships menu item. Once we're done with site improvements we'll be focusing on core CB APIs as we need to move CB forward so we can move our plugins forward.