It now makes sense that the Blu-ray rights were not given to any international publishers because a “5 Centimeters per Second: Global Edition” will be released on November 18th. It will contain the following languages:

Audio: Japanese, English
Subtitle: Japanese, English, Korean, Mandarin, Thai, Indonesian, Italian, Spanish, German, Portuguese, Arabic

“Voices of a Distant Star” (English dub and subtitles) and “She and her Cat” (5min version, English subtitles) are also included as Special Features in SD (it looks like they were produced in SD). A subtitled digest version of the interview of the previous release is on the disc, too.

Source: Can you Moe?