As many Windows Phone users are enjoying Mango goodness either using developer account or some 3rd party workaround, there are some people who are stuck with update process. Samsung device users are the most with problems in update process, its evident from the fact that AT&T is still testing the latest NoDo and 7392 update for Samsung Focus v1.4 devices. Recently Omnia devices were getting updates from carriers like Orange while other Windows Phone devices got the update long back. Anyway, I really hope Microsoft to deliver Mango update for all the existing Windows Phone devices within span of a month time.
Source: Windows Phone team blog