The official Doctor Who Twitter account confirmed the news earlier today. It's not known what episode was read, but it's likely that it was one of Capaldi's first two episodes, to be directed by acclaimed director Ben Wheatley.
Filming is expected to begin in early January, but readthroughs usually occur one or two days before filming - could filming start on Series 8 as early as this week, or will the BBC be taking a Christmas break beforehand? Either way, it's not long to go...
Series 8 airs in Autumn 2014.
[Source: Doctor Who TV]