2001 will return to select U.S. theatres in 70mm beginning May 18, 2018. No news yet about releases in the rest of the world (either in 35mm, digital or 70mm).
Also, the 4K UHD Blu-ray (now disappeared from Amazon US and France) will be now released in "the fall of 2018".
From the Warner Bros official press release:
For the first time since the original release, this 70mm print was struck from new printing elements made from the original camera negative. This is a true photochemical film recreation. There are no digital tricks, remastered effects, or revisionist edits. This is the unrestored film that recreates the cinematic event audiences experienced 50 years ago.
image © Warner Bros 2018 - from Variety.com