Yesterday, we received official confirmation from Intel that its incoming 9th generation Core family is still based on Coffee Lake architecture, which underpins current 8th generation processors. A total of 7 processors were revealed, ranging from the Core i3-9100 to the Core i5-9600K.
Now, another official Intel document has been posted

Source: Hot Hardware – Intel 9th Gen Core 9000 Series Coffee Lake S Processor Specs Confirmed