As if there hasn't been enough discussion on this, I recently spotted this on LinkedIn:
https://www.linkedin.com/jobs/view/3109363855/
Senior Analyst Lounge Product & Strategy Development
JetBlue is looking for a Senior Analyst to join Product Development’s Ground Experience (GEX) team in NYC. The Senior Analyst will play a critical role in developing and implementing strategic GEX initiatives, focusing on those related to forthcoming Transatlantic flights, such as lounge solutions in relevant BlueCities, ground transportation partnerships, and more.
The consensus seems that there would be a lounge space of some sort once the combined T5/6 is complete. However, one would think they'd also need a solution for BOS and possibly European destinations as well.
-J.