Ability to remove Release Date (internal) - change of plans is the reason for wanting to remove the date (for now) so that I could articulate that this is not scheduled in for the short term, rather than push the date out.
Thank you for your idea. It is currently possible to mark an existing release as a parking lot. You can do this by opening the more options menu and checking the box next to Parking lot. This will remove the release date and place the release in the parking lot section of the features board.
Given the option above, it is unlikely that we will make changes to allow releases with no dates. We hope you can understand.