Honestly I am hoping they upset the market like AMD did with Ryzen CPU's, yeah it wasn't the best at launch but a few years later, it's a lot better and is mostly the choice for people who want performance and a low price.
I know I am probably crazy thinking that Intel would actually release something at a decent price but you never know, as NeverBackDown said they have from our knowledge limited developer support and probably limited driver support for this potential level of GPU.
For me as long as they can compete with nVidia and do it whilst being cheaper then I would be happy to buy a card from them, when I need to buy a new card because at the moment for me, AMD just has nothing really that is a "upgrade" more like a side grade, and I am not about to drop over £1k to get an upgrade for something, that to me should be around the £800 at the most.