Here are, apparently, the official previews of the upcoming English version. (Some disputes exist regarding authenticity)
Also, there is the fan work, which does not use any official English work. It uses original Japanese Miku or Miku Append, possibly also Luka in some cases; it still manages to sound as English Miku - sometimes bordering on the impossible.
Basic information (you should know this already):
In summer 2011, Crypton held a contest for the design of "American Miku", for promotional use.
I have seen lots of criticism of English!Miku and I'd like to call those who, like me, think she deserves some love and support. Of course there is the general Miku FC (which I joined); this one is specifically for those who believe that she is beautiful in English also, and should use it, well, to take over the world and what not
Well yes, she sounds like a Japanese person singing in English (and in pretty good English, just with an accent). I think she sounds great like that.
This is not in any way to the detriment of native Engloids! Different niches and all.