Jean-Eric Vergne has used Twitter to reveal that he won’t be driving for Toro Rosso next year.
Red Bull’s Helmut Marko told this writer in Abu Dhabi that an announcement would come next week, so clearly Vergne has decided to or been allowed to pre-empt that.
Once source told this writer than Vergne has known since August – in effect when Max Verstappen entered the picture – that he would be out. It’s understood that team principal Franz Tost was keen to retain him in order to have one experienced driver in the line-up, but the decision was made by Red Bull.
The Frenchman said: “Despite a good season & 22 pts, I’ll not drive anymore for Toro Rosso in 2015. Thanks for those years. Let’s go for another big challenge.”
Confirmation of his departure obviously leaves the door open for Carlos Sainz Jr, who drove for Red Bull in Abu Dhabi yesterday. GP3 champion Alex Lynn, who tested for Lotus today, could be the logical choice as third driver for STR/RBR.
Adam Cooper's F1 Blog 
Hope the Williams role not filled comes to pass for him.