Arena is currently on M19 train, and while core sets are cool, as far as card acquisition goes, I would much rather have some Ixalan or Dominaria.

Also, I was HELLA pumped for drafting Esper Control in Dominaria drafts, but have never got the opportunity to do so.

So, will there be limited with those sets, to pick up the older cards, and re-experience the formats ?

TL;DR: yes.

There is an official event calendar here: https://mtgarena.community.gl/forums/threads/41988

And then there are loose pieces of information on various channels like reddit or twitter, so by now we also know that "some kind of Ixalan block limited" is supposed to happen in the second half of december. Also, the secret event for next friday has been revealed. Google for Nox Cascade.