From the Reddit forums the folks were saying that Panther Lake is Cougar Cove/Darkmont.Which explains why Intel barely mentioned anything about the successor to Granite Rapids, since it's 2 years away according to that info.
You sure about the client names? You'd think Panther is Panther and Nova is Cougar.
Nova Lake is Coyote Cove/Arctic Wolf.
(Apparently internally Intel refers to Coyote Cove as Panther Cove still. But externally it didn’t make sense for them to reference Panther Cove with a generation past Panther Lake.)