Here's what a Jira issue preview looks like in slack today:

WIBNI Jira previews in Slack worked like the "inline" format of a smart link in Confluence, e.g.,

The way a smart link to an issue is displayed in Confluence in "inline" mode has the following advantages over the current unfurling format in Slack:
- The link is inline in the text so the conversation is not disrupted
- The link is visually distinct within the text
- The link contains the relevant information about the issue in a single line with no boilerplate, i.e., Issue Type, Key, Summary, Status
- the action buttons included in the current issue preview in case you want to do something add a lot of boilerplate which is very disruptive to the flow of conversation, and are not really needed - if you need to perform an action on the issue, just click on the issue, or support right-clicking to see a pulldown menu of actions
- If there are several issues under discussion, you don't end up with the actual text of the discussion scrolled off the screen or generally buried in boilerplate
If you're interested, please upvote/watch and comment on Atlassian's API-698.
Thanks!