Some new future releases I'm aware of:
Jeremy Denk – c. 1300 – c. 2000, "music from Machaut to Ligeti—with Binchois, Gesualdo, Stockhausen, Philip Glass, and many others in the middle." (Denk will release Ives Violin Sonatas with Stefan Jackiw, but I don't know if this coming this year or next; I saw them playing the sonatas last year and it was amazing)
Martin Helmchen - Vingt Regards sur l'Enfant-Jésus (Alpha, February):
https://www.prestomusic.com/classical/products/8539819--messiaen-vingt-regards-sur-lenfant-jesusAlban Gerhardt - Bach's Cello Suites (Hyperion, late March):
https://www.hyperion-records.co.uk/dc.asp?dc=D_CDA68261/2A few other 2019 releases (later months):
Doric String Quartet - Britten's complete quartets
Belcea Quartet - Janacek quartets with Ligeti's first one
Steven Osborne - Beethoven 109/110/111
Danish String Quartet - Prism II, with Beethoven op.130/Grosse Fuge plus Schnittke
Ian Bostridge/Thomas Adès, Winterreise, live at Wigmore Hall
Gerald Finley/Julius Drake, Schwanengesang/Vier ernste Gesänge
Also: Angela Hewitt re-recorded Bach's Partitas for Hyperion, but I don't know if it's coming this year. And I
think, but not I'm not absolutely sure, that András Schiff is recording late Brahms for ECM.