Revealed on March 21, 2017 as an exclusive, labeled "Proto Suit" Boba Fett.
On April 12, 2017, it was officially confirmed that this is a shared exclusive with HMV, the U.K. and Hong Kong store.
Note that the real prototype Boba Fett does not have a dent on the helmet. This figure is clearly a re-paint of the prior Wobbler Boba Fett.
The Funko website claims the release date is February 19, 2017, but that appears to be too early.
Item number: 13654-WR-1DM