
Originally Posted by
Marlamin
The "v" in wowv3/wowv4 stands for vendor. We don't know for sure what these are, but Overwatch's vendor products are used for testing at vendors like AMD/Nvidia/localization partners, so these likely have a similar goal.
For WoWs other vendor products, they usually push things like PTR and Beta builds to these products closely to them being released to the public. For example, vendor 2 is currently a few builds ahead of PTR.
Playtests wouldn't happen on the vendor products as these builds aren't meant for public consumption and releasing one vendor build to the public means all vendor builds ever become public (encryption key becoming available).
However, if they were to update/reuse one of the old demo/event products and push a public build to that, that is definitely an indication of something public being on the way (or well, out). They could hold off until they literally announce something like a public playtest before doing that, though.