(I'm on edge.launchpad.net)
Author and date information tends to be on the left (see: comments), and I always expect to see the date and reporter at the top of the bug, on the left. The existing text is kind of floating around in the middle of nowhere, outside the nice new style of the other information on the right. Plus, it duplicates the bug number. It seems like it would be better to position this information at the bug summary on the left, since the date and author is part of the summary metadata in the same way that the comment author/date is part of the comment metadata. Plus, the bug number wouldn't need to be repeated (it's already there, right under the title). An alternative would be to place it just above the summary, as it would be for comments.
I think I know what he'll say, but we need a comment from Martin A. on this before triaging.