W Pair Production at the LHC - I. Virtual O(alpha_s^2) Corrections in   the High Energy Limit
  We present the result for the two-loop and the one-loop squared virtual QCD corrections to the W boson pair production in the quark-anti-quark-annihilation channel in the limit where all kinematical invariants are large compared to the mass of the W boson. The infrared pole structure is in agreement with the prediction of Catani's general formalism for the singularities of two loop amplitudes. 
G. Chachamis, M. Czakon and D. Eiras