I think they are actually new barriers because on the different screenshots they have different heights and widths. On one of the screenshots of the white wooden fence we can see the pillars much higher than the fence itself. Of course, everything could be made by pieces, but that would require a lot of pieces. If instead of barriers they are new building fences, then I guess we'll get different sizes for each variation.It's either a new fence/barrier or one of the frontier staff who built all those walls is crying over a tub of ice cream after building all those custom walls.
The 4 potential new fences or barriers are:
- stone fence
- wooden picket fence
- horizontla iron fence
- horizontal plank fence
Personally, I've been asking for those since I started playing the game before the Australia pack was released! I can't wait for Monday to see if they are new barriers, new fences or just custom made with thousands of small pieces.