Although it's not of Capaldi in his Twelfth Doctor clothes, it's a step in the right direction! A new 'Regeneration Set' based on the end of The Time of The Doctor has been announced for later this year, with more alt-heads than you can shake a Gallifreyan at.
The figure, which comes based on Matt Smith's Series 7B purple tweed outfit, features 2 alternative heads - one of his 'aged' appearance having spent centuries defending Trenzalore (which frankly looks totally horrifying!) and one of Peter Capaldi's Twelfth Doctor (which, despite the oddly ever-present raised eyebrow, is about a hojillion times better than the 3.75" Regen Twelve). The body even comes with a removable bow tie, to fully recreate the Twelfth Doctor's arrival on screen.
Other accessories include The Doctor's sonic screwdriver, a walking stick, and perhaps best of all, Handles - The Doctor's Cyberman-head companion during the earliest parts of his time on Trenzalore. Considering this set's penchant for alternative heads, god I hope you can shove Handles onto The Doctor's body. That would be amazing.
The Time of The Doctor 5" Figure Set will be available for $34.99 later this year in both the UK and the US.