A lot of touring bikes and cyclocross bikes are starting to use disc brakes now, namely Avid cable disc, but I have seena couple of long distance TT bikes fitted with similar 'prototype' disc brake systems, especially on the front. By the looks of the bike in OP's post, it isn't for the aero advantage, because the tripple clamp forks would instantly out-weigh any benefit there, and compact road brakes aren't a massive aerodynamic issue, especially on modern tt bikes where the frame/fork is designed to improve airflow over this area of the bike, and it isn't for the weight advantage, as there are brake setups on the market which are going to weigh a fraction of this disc setup. I think this is probably just for the bike tarts, and perhaps just because they can. Ultimately pointless on the road.