"... by Vladimir Kramnik, who suddenly entered the press room in Wijk aan Zee during the round! As it turned out, the ex-World Champion was to sign a contract later that evening together with Levon Aronian and a sponsor, for a 6-game match (classical games!) in the last week of April."
http://www.chessvibes.com/reports/tata-r11-aronian-loses-to-navara-still-leads-by-half-a-point
"... by Vladimir Kramnik, who suddenly entered the press room in Wijk aan Zee during the round! As it turned out, the ex-World Champion was to sign a contract later that evening together with Levon Aronian and a sponsor, for a 6-game match (classical games!) in the last week of April."
Non-WCC matches do not happen often. The last in my memory was a "friendly" non-rated, Polgar vs Kaidanov in a Sicilian Theme match http://www.chessbase.com/newsdetail.asp?newsid=6155