It's not completely clear (we'll find out soon as seats are going in as we speak), but that may be exactly what is happening at New WHL. The season ticket booklet for the new stadium says:
The front of the South Stand has been future-proofed for Safe Standing. If legislation changes, this will become a standing area so please bear this in mind if choosing a seat here. The integral safety bar is 900mm high – approximately the shoulder height of the supporter sitting in front. This will not impact on sightlines for adults, however it is not an area that is deemed suitable for children and as such, Junior concessions do not apply here.
It's not clear from this if the bars will be there from the start, of if it's just an indication that they might be installed in future and something to bear in mind.
As I said though, it won't be long till we find out exactly what's being installed there.