The following is a quote from the Hatsune Miku Channel on YouTube.
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The song is created by Sapporo-based artist BSC aka kuni, expressing the wish that everyone is able to connect to each other through music.
This message of peace and unity is conveyed using Miku's English singing voice.

Make the world yours by creating music for everyone!
HATSUNE MIKU V3 ENGLISH software release to be announced soon!
Check back for details on Crypton's HATSUNE MIKU V3 ENGLISH page:
http://piapro.net/vocaloid/mikuv3e.html