While technically not a Sherman, it's in the 'family' as a distant cousin! Dragon has announced a new kit in 1/35, 6789 M6A1 Heavy Tank Black Label, at the Nuremberg Toy Fair for future release.
This is now in My Hobby Info and available to add to your Wish Lists.
You never know Jeff, could be the start of something interesting on Dragon's end. This whole 'Black Label' designation seems to be aimed at very specific subjects so it could happen!