Wire’s independent security review – Server source coming end Q1 2017
medium.comDirect link to the report itself https://www.x41-dsec.de/reports/Kudelski-X41-Wire-Report-pha...
Why just review the source of the crypto? Why not the rest of the software used by Wire?
They reviewed protocol implementation and the post on Kudelski site says that they'll tackle the complete solution in the next phase.
I'm no expert but these reviews are no trivial matter, takes time and effort.