There's certainly a proposal. You can
read the BIP here and the relevant part of the roadmap
here. Even small changes take time to go through the peer-review process and this one is actually a fairly big change, so I don't believe there is a fixed date for release or anything like that.
That draft BIP is only for the details of the signature algorithm itself, since there is no standardized way to do Schnorr signatures. It's the equivalent of the SEC 1&2 standards which specify how to perform the ECDSA signing currently used in Bitcoin. That BIP needs more time for review before it is finalized, and then a separate BIP will be needed for actually integrating it into Bitcoin. I'm not following its progress too closely, but I wouldn't expect it this year.
What DooMAD said, Schnorr is at least as big of a change as SegWit, and we all know how easy and smooth of an upgrade that was...
It's far simpler than SegWit, there's even less reason for controversy around it, and it won't be done using the BIP9 process which caused SegWit's unnecessary delays. I could see the Schnorr softfork completing next year.