The format of the subject line in issue e-mails seems to have changed sometime in the last week or so. Were we warned this would change? There's no mention of it in the bitbucket blog.
In my opinion this is a gratuitous change. I fail to see what advantage this format has over the previous one. It has a major disadvantage, however: it likely breaks any filters which bitbucket users may have set up to process/direct messages from bitbucket issues. It broke mine, at least. I'm sure I'm not the only one.