He's obviously going to Mclaren. Ron Dennis hinted that he would hire Alonso again last time. Mclaren's philosophy is to have the fastest drivers available in their cars - remember that people! it is no denying that Alonso is the fastest available driver.
I have a juicy bit of meat that says that both Macca driver's contracts are still NOT SIGNED. Their perfromances were below the level that Ron Dennis wants and at least one of them will be out the door.