Please make the details window in card view non-modal. That is, make it so that it docks to the right-side of the screen and stays open while I click through my cards in the other part of the view.
This would bring your details pane up to par of what Asana and Jira have available.
Currently the detail window is modal and requires one to exit it to click on another card.
Below is a screen capture showing the modal details window in Card view.