Well, catching it after a long beta and then three rounds of release candidates. Indeed, it was apparently caught by an end user, and not those 10K eyes of developers at all.
Were it a problem within IE (or Oracle applications - let's be fair as this is not a Microsoft-only problem) we would have to wait until a developer reads the report, the bug being assigned and the correction being put in a future bug-fix release.
In a way, a guy from Microsoft just made a huge point on how open-source is far superior to their own closed development cycle.