still someone must have done the work to make it right? i mean you and i both know that it costs time and money...
that's what i mean, just because USF has the slot doesn't mean it cost them anything and thus doesn't mean that USF will get heavy tanks. it's cheaper for them to leave the slot then it is to remove it, especially since it leaves it open in case they DO add heavies.
the default settings for each faction have a heavy tank texture slot so removing it would require more work then just leaving it, in addition to the other minor advantages to leaving it.
given that we have seen a model of the pershing (i don't know if anyone has tested it out with the USF heavy camos) there is a good possibility that the pershing will be added, even more so if the heavy camos work with it.