Fwiw.

I have the following rumors to add.

Nids to get valentine love, crons to get leap year love.

Nids:

There are many more nid kits that are done, some no one would expect. However, not all will be released. Others may be single releases later.

4 plastic kits
4 finecast

After the wave there will still be some model(s) not represented from the codex.

Old models getting finecast makeovers.


Necrons:
If you don't know, you haven't been paying attention.

cheers.