The link below is now on the TG website with an overview of their A345 that will be operating the BKK-nyc nonstops. Most importantly it includes some "live" pictures of the new J cabin seats to be rolled out fleetwide.
TG has also updated some of their seat maps to show the new configuration on fleet types like the 772, 744 etc. Excellent quality seat maps showing nearly every little detail.

The A345 seat map shows TG will operate it with the first 2 zones holding C, Zone 3 holding a Y+ in 2x3x2 and Zone 4 holding regular Y with 36".
http://www.thaiair.com/Travel_Destin...hai_to_nyc.htm