I am flying SAW-VIE on TK 1899 on a A320 in Y. Currently I have what is showing up as bulkheads on TK Manage booking site 4C and 4D booked for the 2 of us. I was considering an upgrade for 15k TK miles a person but wouldn't want to do it if it's the same seat with the middle seat blocked. However with proper business class seats I'd be more inclined. I can't seem to find proper info on what it is more likely to be. Any inputs?