Looks like yet another nail in Ice Lake's coffin. Mid-2020 now becomes late 2020, which is very likely after or at the same time as Ryzen 4000. Every step in clock speed that Intel takes with 14nm is one they have to make with 10nm too if they want to improve performance at all. They're making it harder for themselves at this point.
Intel has even had to concede on its high-end TDP, further widening the power consumption gap that AMD made with Ryzen 3000. If i9-9900K numbers are anything to go by, these CPUs could consume more than 200W, perhaps beating AMD by 5-10% single-threaded but still miles behind otherwise. If the i9-9900KS wasn't already reminiscent of the FX-9000 series (or Pentium EE), then Comet Lake certainly will be.
intel isn't able to get high clock speeds out of their 10nm process. thus far the only planned 10nm release is for their atom/low end mobile chip lineup, and apparently (per some insider leaks) while there is a 15% ipc improvement over current atom processors, there is almost a 20% max clock speed hit, netting a nearly -5% total performance from their 10mn node.
Let's not exaggerate the numbers, Intel claims an 18% IPC improvement and a 4.1 GHz peak boost clock for a quad core i7 mobile CPU, at 28W TDP. Intel's current highest-tier 28W mobile i7 is the i7-8569U, which has a peak boost of 4.7 GHz and is also quad core. We're basically looking at the very SKU it's replacing. Assuming Intel's claims are true, we should see a 3% single threaded improvement over Coffee Lake. That is still abysmal, but it's certainly no regression.
That doesn't necessarily tell us anything about desktop CPUs; 4.1 GHz may be all Ice Lake will do, even if it turns out to be relatively efficient, which we also don't know yet. Intel says that Ice Lake has been released to OEMs last month so it will take a while before we see any products with it. It's sure to beat Picasso easily, but that isn't so impressive now since that is still on Zen+ with 12nm.
Don't forget the integrated graphics though. If Ice Lake has one selling point, it's the fact that Intel's IGP finally surpasses AMD's APUs. That should be extremely valuable in ultrabooks.