Re: A thought on regenerations (spoilers for "Night/Day of the Doctor" They were clearly referring to Capaldi, but they wouldn't know about the metacrisis. The Time Lords see thirteen TARDISes and assume that all of the Doctor's natural 13 incarnations have shown up to the party. Little do they know that the '13th' Doctor was technically the fourteenth, and that Tennant counts as two. Whether Smith's Doctor noticed Capaldi turn up and thought, "Hang on a minute; I'm the last one - who's he?!" remains to be seen.