According to HuaweiCentral, Huawei has started the trial production of Kirin 1000 processor (which we assume is the correct name) using the 5nm technology process. And it will be commercially launched in the second half of next year. Assuming the timeline follows the same as the past few years, that second half of the year will be at IFA 2020, with the Mate 40 series featuring it a few months later.
It was expected that the Kirin 990 would feature the new Arm Cortex A77 CPU architecture this year, but they opted to stick with A76 but with higher clocks. It was reported that this decision was done due to Huawei not being able to achieve the frequencies they would like on the current EUV 7nm chipset. Currently, the only chipsets that use the A77 are the MediaTek 5G and Samsung Exynos 980. The Meditek is clocked at 2.3Ghz while the Samsung is clocked at 2.2Ghz. The Kirin 990 goes up to 2.86GHz for its two main cores.
This will all change for the Kirin 1000, thanks to the 5nm fabrication process, Huawei should be able to achieve superior clocks, while also having more time to perfect an A77 based chipset. The A77 brings a 20% improvement in performance and with the switch to smaller node size, that improvement in performance should be higher.
Not much else is known about the chipset at the moment. When Kirin 990 I was personally hoping that the 5G chipset would be the default, but then they quickly announced the slower 4G variant at the end of this year's keynote. Hopefully next year we will see the company switch to 5G as standard for the flagship chipset.