The 4K restoration was done for the Blu-ray release, and it was also shown in theaters, in 2012. I saw it in the theater that year.
"On 20 March 2012, Apple announced the film had been restored by hand for DVD and Blu-ray release on 28 May (29 May in North America), later delayed one week to 4 June (5 June in North America). In a released statement, the company stated: "The film's soundtrack album will be reissued on CD on the same date. The film has been restored in 4K digital resolution for the first time – all done by hand, frame by frame." The delicate restoration was supervised by Paul Rutan Jr. and his team which included Chris Dusendschon, Rayan Raghuram and Randy Walker. No automated software was used to clean-up the film’s repaired and digitised photo-chemical elements. The work was done by hand, a single frame at a time by forty to sixty trained digital artists over several months.
In addition to the DVD and Blu-ray re-release, the restored version also received a limited theatrical run in May 2012." Wikipedia
Awesome that it's being reissued for the 50th Anniversary!
Now on to the White Album 50th! ;)