With the fleet decision still pending I found this very interesting article:
JetBlue also said it has executed an agreement to sell four new E190's, produced by Brazil's Embraer Brazilian Aviation Co. (ERJ), according to a filing with the Securities and Exchange Commission. The four aircraft are scheduled for delivery to JetBlue in the first quarter of 2009 and are to be delivered to the third party immediately after, subject to contingencies including lease negotiations, according to the filing
The article states that these 4 aircraft might be going to Azul (Brazil LCC) but you never know...