It includes Reinecke's 3rd PC, Konzertstück op. 33 and Sauer's 2nd PC. Release date on June 7th:
https://www.prestomusic.com/classical/products/9609434--reinecke-sauer-piano-concertos
https://www.prestomusic.com/classical/products/9609434--reinecke-sauer-piano-concertos