Breaking off a piece of the historical drama action

According to the Christian Science Monitor, Robert K. Massie's biography Catherine the Great is being adapted into a "limited series" for ABC. The book was well-received by critics, so I'm assuming ABC is hoping for something a little more high-brow than the CW's Reign, which is loosely—very loosely—based on the life of Mary, Queen of Scots. There is no word yet on when the series will air.