Your not going to find any information other than speculation. = whatever you can find on it = absolutely 0.
Even the few people that gets a sample after it's made are in a NDA and can't give any information/benchmarks till it's released.
For your "DECK OUT HIGH END GAMING BUILD" You can get to a price point that makes no since to go over.
Say you have a 3K build you can add a bunch more cost and get very little performance increase.
Chasing the latest and greatest = you loose a bunch of money for almost nothing their always something just a bit better for a bunch more $ that is just a bit better just around the corner.
EDIT I don't think you will even be able to buy any video card in the next generation (or 2) that will give 240 FPS in all games maxed out even
@2k resolution. First your CPU has to be able to put out the 240 FPS in the game.