this fare has been available all year long :]
Excactly.
Turkish Airlines has had year-around Business class saver fare from Nordic countries to Bangkok in many years (though the fare basis were different).
http://www.flyertalk.com/forum/premi...k-1300usd.html
http://www.flyertalk.com/forum/premi...-1123-r-t.html
http://www.flyertalk.com/forum/premi...-business.html
http://www.flyertalk.com/forum/premi...0-eur-r-t.html