We're getting word from one of our readers that T-Mobile UK is at least rolling out Mango for the Omnia 7. Owners of the Omnia 7 may recall the double/triple asteriks in the international 'Where's my Update' page that plainly stated "Except Samsung Omnia 7 models".
Now, Martrin R. has let us know that he received the notification and successfully updated his Omnia 7 to the final Mango build. We should note that he was on the unofficial developer beta, meaning this could be like the HD7s situation--people on the dev beta can get the update, but folks on NoDo or earlier, not so much.
But it looks like at least some users won't have to try the force-update trick, which at least in this case, is only partially successful for some (see forums). Let us know if you're having any luck with the Omnia 7 in comments.