It looks like your seats are on the upper deck. I haven't flown in Business with Thai but have done so with Singapore whose seats were on the upper deck. It seemed to be quieter and upper class had it's own flight attendants who stayed upstairs throughout the flight. On the Singapore 747 there was extra storage under the windows with a shelf for putting books etc. Usually up in the nose they had wardrobes where the FA'S would hang your jackets for you. It's a strange feeling at first only seeing the nose of the plane with no doors to the pilots. Usually the FA's will learn your names and use them when they speak to you.
It's a great way to travel, the holiday really starts at the airport when you get lounge access. I hope you enjoy your trip.
Make sure you sign on to one of the mileage programs.