I was surprised and pleased that Apple (unlike AT&T and Google) are actually being semi-open about this by bothering to post up their response on their own website.
Anyone interested in looking at AT&T and Google's response, they're all up on
Engadget now.
Curiously, Google redacted the question about the reasons given by Apple for Google Voice's rejection, and for the "wronged party in all this" as Engadget writes, Google's response was pretty short.
John Gruber just published his analysis too.