Ah, I thought so about Pannonian tribes being one of Illyrian ones.
By SLavic homeland, you mean one that some Slavs claim to be root of Slavic peoples (Danubian theory), or just one of them?

Yes, Danubian theory, Slavs as direct descendants of neolithic cultures of Starcevo, Vinca, Vucedol, than later Illyrians, Thracians… It's all well explained in Nestor's chronicle.
This old/new theory gain more and more support among scholars, especially in Russia.