Cisco N5Ks and N2Ks Replacement

I've recently started a new job and I've been asked to look at options to replace our current LAN switches. Basically, we have 6 Cisco Nexus 5Ks (3 pairs); each pair extends to multiple Cisco Nexus 2Ks.

I understand that FEX is now a dying technology, but I'm a bit confused as to what technology is meant to replace FEX. I've done a bit of research on this, but it still doesn't seem clear to me.

Which Cisco switches are meant to be the successors of the N5Ks and the N2Ks?

Thanks