If you click on the link the URL contains openxcampaign=Nov-Sale
I just looked at the IAH-LHR fares and the T fare is showing as 'TLXNAJBS' so presumably a North America Joint Business sale?
The fare details from itasoftware are:
RESERVATIONS FOR ALL SECTORS ARE REQUIRED AT LEAST 7 DAYS BEFORE DEPARTURE
VALID FOR TRAVEL COMMENCING ON/BEFORE 21MAY 12. ALL TRAVEL MUST BE COMPLETED BY MIDNIGHT ON 15JUN 12
PERMITTED 20OCT 11 THROUGH 16DEC 11 OR 25DEC 11 THROUGH 01APR 12 OR 26OCT 12 THROUGH 16DEC 12 OR 24DEC 12 THROUGH 24MAR 13 ON THE OUTBOUND TRANSATLANTIC SECTOR.
TICKETS MUST BE ISSUED ON/BEFORE 15NOV 11
So it looks like a 2 week NA sale. I haven't checked the other classes yet. I also haven't checked dates before 20 October - there may be something similar.