As noted on Intermezzo back in February, Jonas Kaufmann is to play Wigmore Hall on 11 January 2015. Helmut Deutsch accompanies; programme to be confirmed.
Tickets are expected to go on sale in September/October. Prices are not mentioned, but the normal range for a song recital is £15-£50.
Unless you want to rely on returns, your best (though not guaranteed) chance of getting one is to become a Wigmore Hall Friend. Experience suggests all or most requests at Patron or Benefactor level are likely to be satisfied. Lower levels may miss out due to demand.