At it's online press room some new info was posted on Coffee lake (8th gen) processors. Among the things posted are a couple of box shots of the upcoming 8th generation processor, which lists some info.
That packaging now confirms what ASRock already told, the processors require an Intel 300 chipset based motherboard. Considering that it is on print at the box, yes you will not be able to use the new processors on say your current Z270 motherboard.
Coffee Lake (8th gen) six-core processors are based on the LGA1151 socket, but will require a new motherboard chipset. They have a TDP of either 65 or 95W. Currently the release lineup looks like this:
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| Processor | Cores / Threads | Clock speed | Turbo 2.0 | 1-core Turbo 3.0 | L3 | TDP |
| Core i7-8700K | 6/12 | 3.8 GHz | 4.3 GHz | 4.5 or 4.7 GHz | 12MB | 95W |
| Core i7-8700 | 6/12 | 3.2 GHz | 4.2 GHz | 4.4 GHz | 12MB | 65W |
| Core i5-8600K | 6/6 | 3.8 GHz | 4.2 GHz | 4.4 GHz | 9MB | 95W |
| Core i5-8400 | 6/6 | 2.8 GHz | 3.5 GHz | 3.8 GHz | 9MB | 65W |
| Core i3-8350 | 4/4 | 4.0 GHz | na | na | 8MB | 95W |
| Core i3-8100 | 4/4 | 3.6 GHz | na | na | 6MB | 65W |
As you can see there will be be two 6 cores models with HT (12MB L3), an two without HT (9MB L3). The four core models (8MB L3) will not get hyper-threading, which confirms earlier rumors.
