The Panopticon/Twelfth Doctor?

From Tardis Wiki, the free Doctor Who reference

Now that we have seen a glimpse of Peter Capaldi as the Doctor in The Day of the Doctor (TV story), shall we call him The Doctor (The Day of the Doctor) for now, or shall Twelfth Doctor be unprotected? Unless him being the twelfth Doctor would be too speculative for now, based on the aired episodes?

(not a spoiler - just asking whether it would be OK to assume that the incarnation is the Twelth Doctor or not based on what's aired)