GVA BA Terraces Report
A brief summary for AA flyers, to supplement the information in the BA threads linked from the OP:
I was here a couple months ago. After clearing security, the lounge is to the right upstairs. It's a small lounge, with windows that overlook one of the moving walkways. The usual assortment of drinks were out in the afternoon, along with a rather disappointing selection of individually packaged cookies, no sandwiches. Free wifi is available, but requires an access code that you text to yourself from the access page. Boarding announcements are made in the lounge, which was about a 5 minute walk from the gate, where the boarding scrum seemed to be already in process.
Overall, nothing to write home about, but probably still better than waiting at the gate.