Fairly unlikely however it is possible as not much is explained about the weeping angels in "Blink" except that they come from the early universe. Perhaps more will be explained in series five when the weeping angels return.
No, but it would be very cool if there was an angel queen/king/emperor. If there was, I hope it's a golden, giant weeping angel in a tomb under the white house.
There has been rumors that the Statue of Liberty is a weeping angel in the new series. Now she sounds like a leader.