The finale of Bond 23 is to be shot at Duntrune Castle in Argyll, Scotland according BBC News. Speaking to the castle’s owner, the article says:
Patricia Malcolm, who lives in the castle with her husband Robin, said several days of filming would start at the end of February 2012.
Mrs Malcolm said: “They are coming here at the end of February and are going to film for several days.”
Filming is scheduled for the end of February and according to Mrs Malcolm it is suppsed to be Bond’s ancestral home, which will be attacked by land and sea.
According to Wikipedia, the castle is thought to be the oldest continuously occupied castle in Scotland and built by the MacDougall clan in the 12th century, although it was later taken by the Campbells and then sold, in 1792, to the Malcolms; the current owner, Robin Neill Malcolm, is the clan chief of the Clan Malcolm.