According to the New York Times:
“Mr. Jarrett turns 70 in May. To mark the occasion, ECM has scheduled two releases: a classical album and an album of solo inventions.”
More information can be found in an article by JazzEcho, where it is mentioned that both albums should be released on May 8, 2015. The first one, entitled “Creation”, includes nine pieces from six solo concerts recorded in 2014 in Tokyo, Toronto, Paris, and Rome. The second one, entitled “Samuel Barber/Béla Bartók”, includes compositions by Barber and Bartók, recorded in 1984-85 with the German Radio Philharmonic Orchestra Saarbrücken Kaiserslautern (directed by Dennis Russell Davies) and with the New Japan Philharmonic (directed by Kazuyoshi Akiyama).
Thanks to Helmut and Christoph for the links.