I honestly do have no idea, but I can say seven long-haul routes that have been getting serious talk lately:
Dallas-Madrid
JFK-Moscow
JFK-Nice
Miami-Asuncion (a go once Paraguay finalize a new incentive package)
Miami-Milan (looking likely, but not until winter 2008)
Miami-Recife (a go once approved by Brazilian authorities)
Miami-Salvador da Bahia (a go once approved by Brazilian authorities)
Maybe it is one of those?
Do you mind linking to this post?
On what I do know...AA will announce more Colombia flights (but not new destinations) next week.