Currently you are able to send features to Trello from Aha and their status will be updated as they are moved in Trello. However comments and attachments that are added to Trello cards/features do not move to Aha. Enabling this feature would allow our developers to use Trello for their day to day tasks and for us product managers to better see what they are doing.
We just released an enhanced Aha! integration with Trello that allows you to have full control over the way information flows between Aha! and Trello — in both directions. Plus custom fields, faster imports, and automatic updates.