I'm curious to see what they're going to do with the seating layout. The stock seats from Bombardier/Airbus are 2x3, with the middle seat being 19" wide. However, I'd assume that JetBlue would want to install their Rockwell Collins Meridian slimline product with the next-gen entertainment system, so who knows whether they'll just slap in the Airbus seats, or if they'll actually customize the seats for this aircraft.
As for transcons, the new slimline seats, even with the two added rows, actually weighs less than seats from the old layout, so refreshed A320s might not need the tech stop for transcons anyway.