Good question. Their was a link in the announcement email but it links to nothing where the pre-release order can be made.
As for if/when it will be available for ArchiCAD, when they say Yes, later they mean No, perhaps later. In any case, I found this link --
https://novedge.com/products/15805
When I was using version 3 I asked if 4 would be compatible with 4K screens which are all I have to use Maxwell with. They said "Yes, it will be." So I ordered it. It still is not compatible with a 4K screen which makes it nearly unusable to me. And I don't know if 5 is 4K or better compatible either. I would like to demo version 5 for myself ( beta version would be ok) before I upgrade this time. No 4K or better compatibility - no upgrade this time ! I am wanting to buy an 8K monitor and I would like Maxwell to look good on that screen as well.
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