Found this on a random blog today, under the title "Showtime's made a huge mistake." Now I was never a big fan of Arrested Development, so I don't much care if it's gone for good or not, but is it really fair to blame Showtime when the article says:

R.I.P., 'Arrested Development' -- critics' fave not given room to grow: "A source close to the negotiations said that creator Mitch Hurwitz had
decided after a lengthy period of debating an offer from Showtime that
'Arrested Development reached its end, creatively, as a series.'"