Update: Gigabyte has confirmed that they will be working on custom Radeon RX Vega 64 GPUs but there is just no news on the horizon. So you will need to wait to get your hands on one of these GPUs. AMD is having some supply issues so that could be one of the reasons why this is so. Rest of the story is as follows.
People have been wondering about custom Radeon RX Vega GPUs and it seems that it is a complete no from Gigabyte, at least when it comes to the AMD RX Vega 64. The company has said that it is not looking into making any custom Radeon RX Vega 64 GPUs but they might introduce some custom RX Vega 56 GPUs.
AMD Radeon RX Vega GPUs have been sold out pretty much everywhere and AMD is having a hard time getting AIB partners the GPUs that they need in order to start working on the custom coolers and what not. The only custom design card that we have seen is the one from Asus and even that seemed like a PR stunt instead of an actual card.
The Asus version was tested by Jayztwocents and it seems that the reference design model is able to run at a higher frequency as compared to the custom version. This was very odd but the Asus version offers close to no improvements at all. The custom GPU does not have much room for overclocking and due to temperature offsets, the frequency just comes down straight away.
If this is the official word from Gigabyte then it might be the case with other AIB partners as well. It is possible that they have had enough of waiting and are looking into better things to do. What better things you ask? Well, it is most likely the GTX 1070 Ti that will most probably be coming out in late October.
The GTX 1070 Ti will be taking on the AMD RX Vega 56 and as mentioned below, it will offer performance closer to the GTX 1080 but at a less expensive price point. The difference between the GTX 1070 Ti and the 1080 is mainly the type of memory that will be used. You can check out the details here.