You can now close incidents from the dashboard (instead of having to be in the relevant incident channel). This is particularly useful when tidying up old incidents ready for analysis. It also continues to bridge the gap between what's possible from inside Slack vs. the dashboard.
When we're working on a big feature like announcement rules (and the workflows engine which powers it), we work hard to stay focussed on the task at hand. This can make us feel uncomfortable as we constantly come across things that we'd like to improve: either from customer feedback or from our own usage of the product.
To make sure we stay focussed on the big ticket items, but not letting our backlog of polish and bug fixes grow uncontrollably, we schedule time between big projects to knock items off the list. We call these wiggle weeks (an idea inspired by a great Intercom blog post). As you've probably guessed, this was one of those weeks.