The official Twitter account for Crypton Future Media's Vocaloid2 CV series of virtual singer software confirmed that Hatsune Miku's Official Facebook account has over 39,390 fans.
The said account added that the staff will "officially inform that 'Hatsune Miku sings in English' later." Crypton President Hiroyuki Itoh had revealed at New York Comic Con last month that his company is planning a English version of Hatsune Miku, and he asked for 39,390 fans to show their support on Facebook to demonstrate the demand.
The number 39 can be read in Japanese as "Miku" or "thank you" or sankyū.
Source: ANN
Well, the entire Vocaloid group has a lot of Engrish covers made by fans, so it is possible that we can see them singing in English... perfectly. Sample? Here.