That would make sense of course. But looking at potential projected power draws of the top navi, which could be around 320-360W, a three(3) fan 2.5 slot is bare minimum by the look of it.
Water cooled edition could be incoming to cool that puppy,
If the firmware stuff that was leaked is legit there were two profiles 230 watt and 250 watt and I assume they are the graphics core and not total board but I have no idea on that. Suggests to me they only have two products on the top tier core or very close derivatives if there are more.